Re: help needed installing USB to Serial Cable for ADTPro

[Raymond Wiker via cctalk]

> On 11 Mar 2017, at 06:39 , Joe Giliberti via cctalk  
> wrote:
> 
> Greetings!
> I am trying to connect my IIc to my laptop through ADTPro and am
> having trouble getting the FT232R adapter I bought from Retro Floppy.
> The host computer is an HP Elitebook running Windows 7 Pro 64-bit.
> When I first plugged in the cable, Windows tried and failed to find
> the device drivers. I downloaded the drivers from the manufacturer of
> the chip and and ran it. It told me installation was successful and
> device manager recognized that there was a USB serial port, but
> reported an Unknown Device and a Base System Device that didn't have
> drivers installed. I tried to use ADTPro but it didn't see a serial
> port.
> 
> Has anyone run into this issue before?
> 
> Thank you in advance!
> Joe Giliberti

Could it be that your FT232R adapter is using a counterfeit chip? FTDI changed 
their drivers some time back so that they refuse to work with chips that are 
not manufactured by FTDI.

Re: Vintage Computer stuff on EBAY.DE

[Martin Meiner via cctalk]

Hi Eric, 

First of all: Yes - you can log in to eBay.de with your .com account. It is no 
problem. Why my stuff doesn't show up on ebay.com, I don't know: I haven't seen 
a setting to make this happen. 

True, the items are in Switzerland, the country to Chocolate and also where the 
WWW was invented :) 

As they are bulky, I cannot just send them out by regular post. Either the 
buyer comes and picks them here, or they make their arrangements to have them 
shipped. Incidentally, the 2 PDP11 on sale were bought by me some years back 
from eBay.com and were located upstate NY, and then shipping was arranged to 
Switzerland. 
In other words: come and pick the stuff or arrange for a forwarding company to 
bring you the stuff. 

Cheers, 
Martin 




  From: Eric Christopherson 
 To: Martin Meiner ; General Discussion: On-Topic and 
Off-Topic Posts  
 Sent: Friday, March 10, 2017 8:41 PM
 Subject: Re: Vintage Computer stuff on EBAY.DE
   
On Fri, Mar 10, 2017 at 1:34 PM, Eric Christopherson 
 wrote:

Hi, Martin.
On Fri, Mar 10, 2017 at 1:24 AM, Martin Meiner via cctalk 
 wrote:

Hello friends of vintage computing,

As I need the space at home, I am parting from some of my vintage gear. They 
have all been listed on EBAY.DE.
Among others, there are two PDP11 V03 systems, a number of CRT terminals and 
others. Have a look and see if you find something of interest.
Head over to EBAY.DE and search for "PDP11 V03", and then see all my other 
actions.
Just thought I'd let you know..


I'm trying to pull up your ADM-3A (222434344378) on the US eBay site, but it's 
not showing up there. Do you know why that is?
(I've never bought from a foreign eBay domain, so I'm not sure if I can just 
log in there as I would on the US site, watch items, etc., and have it all 
propagate from one domain to the other.)

Oh, I see it's for local pickup only (and you seem to be in Switzerland), or 
maybe shipping to Germany:"Möglicherweise kein Versand nach Vereinigte Staaten 
von Amerika - Lesen Sie die Artikelbeschreibung oder kontaktieren Sie den 
Verkäufer, um Informationen zu Versandoptionen zu erhalten."translation via 
Google:"No shipping to United States of America - Read the item description or 
contact the seller for shipping information."
and:
"Da die Wahre raus muss, verkaufe ich den Gegenstand für Selbstabholer (oder 
Transport vom Käufer selber organisiert) ab EUR 1 ohne 
Mindestpreis."translation via Google:"Since the truth must go out, I sell the 
object for self-pickup (or transport organized by the buyer itself) from EUR 1 
without a minimum price."
-- 
        Eric Christopherson

   

help needed installing USB to Serial Cable for ADTPro

[Joe Giliberti via cctalk]

Greetings!
I am trying to connect my IIc to my laptop through ADTPro and am
having trouble getting the FT232R adapter I bought from Retro Floppy.
The host computer is an HP Elitebook running Windows 7 Pro 64-bit.
When I first plugged in the cable, Windows tried and failed to find
the device drivers. I downloaded the drivers from the manufacturer of
the chip and and ran it. It told me installation was successful and
device manager recognized that there was a USB serial port, but
reported an Unknown Device and a Base System Device that didn't have
drivers installed. I tried to use ADTPro but it didn't see a serial
port.

Has anyone run into this issue before?

Thank you in advance!
Joe Giliberti

Re: RT-11 5.x install tapes?

[John Wilson via cctalk]

On Fri, Mar 10, 2017 at 08:56:34PM +0100, Jörg Hoppe via cctalk wrote:
>- I saw that neither 5.5 nor 5.6 has no DD, but 5.0 -5.4G and 5.7 has.
>Didn't understand the reason.

They brought back some long-dead drivers for the final release.

>- Also DD.MAC in the 5.0 - 5.4 and 5.7 changes often.
>I tested tu58fs with oversized TU58 tape for 5.3 and 5.7, the number of
>blocks is always patched into into offset 0x2c, 0x2d in DD.SYS

I don't know why you're saying that in hex ...

>- I made a working DD.SYS  with
> .macro DD,
> .link DD,
>.rename DD.SAV DD.SYS

I think you probably want "link dd/nobitmap/exe:dd.sys".  The /nobitmap
gets rid of some of the junk in block 0.

>Do you know how to make DDX.SYS? Must be a conditional MACRO symbol.

You want to stick XM.MAC in front of your source file.  I can never
remember the exact DCL syntax.  Something like "mac xm+dd/obj:ddx".

John Wilson
D Bit

Re: Tape reel data recovery from MERA-400 polish computer

[Jon Elson via cctalk]

On 03/10/2017 01:40 PM, Paul Koning via cctalk wrote:
A stretch with no transitions occurs of course at the 
block boundary (the gap). It also apparently occurs in 
other spots, for a few bit times: tape marks seem to 
consist of two frames separated by a few clocks worth of 
blank space. Ditto between data and block check frame(s), 
if I remember right.
The classic NRZI definition for 800 BPI 9-track is that 
there is a 2-character gap after the end of the user data 
block, then the CRC and LRCC characters follow.  We had some 
tapes made on out IBM 360 that had little short gaps all 
over them, as they had the machine misconfigured and were 
exceeding memory bandwidth.  The IBM could read them fine.  
I think they only detected the big gap to define the end of 
the record.  Our DEC controllers all used the 2-character 
gap to detect where the block was ending.  No way to fix 
that if the hardware tape control decided those gaps were 
the end of data.


Jon

Re: Tape reel data recovery from MERA-400 polish computer

[Jon Elson via cctalk]

On 03/10/2017 12:58 PM, Paul Koning via cctalk wrote:

On Mar 10, 2017, at 1:39 PM, Al Kossow via cctalk  wrote:


The next extension is to track the tachometer values so that you can detect and 
compensate for tape stick/drag
which is absolutely critical for formats that don't self-clock, like NRZI.

NRZI is not self clocking if you consider an individual track in isolation.  
But it IS if you consider all the tracks at the same time, provided either (a) 
the data is recorded with odd parity, or (b) the all-zeroes data character 
isn't used.  (a) is the case for 9-track tapes.
Yes, but the problem is 800 BPI is about the upper limit on 
density due to tape skew.  I don't know for sure, but I 
strongly suspect that skew gets worse as the tape gets 
older.  I've seen some tapes that were only a few years old 
where the skew got very bad.  You could put a scope on the 
skew alignment test point and see the skew pattern pulsing 
as the supply reel rotated, meaning the tape got 
differentially stretched while sitting on the reel.


But, glad they were so successful in their effort!

Jon

Re: I hate the new mail system

[Mouse via cctalk]

>> RFC 3912 doesn't specify what output the whois server is supposed to
>> send.  Everybody "assumes" that it should be the complete domain
>> information, but that's simply not the case.

>> Imposing this assumption is what Mouse does, and that is wrong.

No, that is not what I'm doing, though I can certainly see how you
could come to that conclusion.

I'm not expecting/requiring/whatever that the relevant WHOIS server
return all available information.  But there is a lot of room between
that and returning no contact information whatever, which latter is
what DENIC does when queried in the usual way, ie, just the domain name
without any DENIC-specific text.  And that's well on the "unreasonable"
side of the line.

In my opinion, of course.  It's my mailserver, so that's what matters.

>> This option is completely legal [...]
> Legal in what sense? 

I make no claim about its legality, in either the RFC sense or the
off-net-law sense (except that I believe I am within applicable off-net
law).  I simply consider it antisocial and uncivilized, and am not
interested in accepting mail from any domain within its bailiwick.

/~\ The ASCII Mouse
\ / Ribbon Campaign
 X  Against HTMLmo...@rodents-montreal.org
/ \ Email!   7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B

Re: I hate the new mail system

[Pete Turnbull via cctalk]

On 09/03/2017 09:50, Christian Corti via cctalk wrote:

On Thu, 9 Mar 2017, Tor Arntsen wrote:

I did an strace and I can confirm that the Linux 'whois' client that I
used from those various sites sends '-T dn' (or actually -T dn,ace)



I did a little research on that:
The '-T' option is passed to the whois server, it's not a client option.


I don't think Tor has suggested it's a client option, and I certainly 
did not.  It's simply part of the string that one particular client 
knows to send to DENIC, and which at least one other client can be 
forced (manually) to send.



Intelligent or modern clients know what options to pass to the
appropriate server, in this case '-T dn' to the DENIC whois server.


Well, for one value of modern :-)  The RIPE client which DENIC 
themselves recommend people to use, does not do that.  It has to be 
cajoled into sending the "-T dn" along with the query string.



This option is completely legal and was introduced at DENIC in an
attempt to better protect the domain holder's privacy (you know,
different country, different rules). This was many years ago, but it's
still there.


Legal in what sense?  It's not part of any RFC, and appears to be unique 
to DENIC.  I regularly use dozens of whois servers and not one other 
honours, let alone requires, that option. Also not that RFC3912 gives a 
single protocol example which does not require any such option, and 
refers to RFC954 for normative references - ie, they way it should be 
done.  No -T there either.



RFC 3912 doesn't specify what output the whois server is supposed to
send. Everybody "assumes" that it should be the complete domain
information, but that's simply not the case.


That's certainly true.  Very few whois servers return all the 
information; many won't disclose phone numbers, for example.  In fact I 
was surprised how much text /is/ returned by DENIC.



Imposing this assumption is what Mouse does, and that is wrong.


I disagree; Mouse (and I) were simply using standard common whois 
clients and getting either nothing or an error in return to queries.


--
Pete
Pete Turnbull

Re: RT-11 5.x install tapes?

[Jörg Hoppe via cctalk]

Alan,
thanks!

- I saw that neither 5.5 nor 5.6 has no DD, but 5.0 -5.4G and 5.7 has.
Didn't understand the reason.

- Also DD.MAC in the 5.0 - 5.4 and 5.7 changes often.
I tested tu58fs with oversized TU58 tape for 5.3 and 5.7, the number of 
blocks is always patched into into offset 0x2c, 0x2d in DD.SYS


- I made a working DD.SYS  with
 .macro DD,
 .link DD,
.rename DD.SAV DD.SYS

Do you know how to make DDX.SYS? Must be a conditional MACRO symbol.

Joerg




for work on TU58 emulator "tu58fs" I'd like to experiment with
oversized  tape images under RT-11 5.5, 5.6 and 5.7. The images I
know about are the classiccmp collections, Earl Evans  pointed me
to the RT11DV50.ISO archive.
However, in these images the TU58 driver files
DD.MAC/DD.SYS/DDX.SYS are  mostly missing. Strange, because they
claim to be pristine.
Somebody knows about original RT-11 V5 installation tape images?

Here is the DD.MAC file you are looking for.   It was part of
the RT-11 v5.6 sources that Mentec supplied to the Y2K update
team to make v5.7.   Since the last modification was in 1979,
it is safe to assume that it applies to all recent versions.

Have fun!

Alan

--
.MCALL  .MODULE
.MODULE DD,VERSION=21,COMMENT=,AUDIT=YES

;   COPYRIGHT (c) 1989 BY
;   DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
;ALL RIGHTS RESERVED
;
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
;ONLY  IN  ACCORDANCE  WITH  THE TERMS  OF  SUCH  LICENSE AND WITH THE
;INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR  ANY OTHER
;COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
;OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE  IS HEREBY
;TRANSFERRED.
;
;THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE  WITHOUT NOTICE
;AND  SHOULD  NOT  BE  CONSTRUED AS  A COMMITMENT BY DIGITAL EQUIPMENT
;CORPORATION.
;
;DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF ITS
;SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.

.SBTTL  CONDITIONAL ASSEMBLY SUMMARY
;+
;COND
;   DD$PRI  (4) Interrupt Priority
;   4-7 possible interrupt priorities
;
;   DDT$O   (0) two controller support
;0  1 controller
;1  2 controllers
;
;   DD$CSR  (176500)1st controller CSR
;   DD$VEC  (300)   1st controller VECTOR
;
;   DD$CS2  (176510)2nd controller CSR
;   DD$VC2  (310)   2nd controller VECTOR
;
;   EIS$I   (MMG$T) Use SOB instruction (no code effects!)
;   0   simulate SOB
;   1   use SOB
;
;   MMG$T   std conditional
;   TIM$IT  std conditional (no code effects)
;   ERL$G   std conditional
;-

.SBTTL  GENERAL COMMENTS

.ENABL  LC

;+
; ABSTRACT FOR CODE FROM WHICH THIS WAS TAKEN:
;
; THIS MODULE MAY BE ASSEMBLED TO YIELD EITHER THE RAM PORTION OF A PDT
; DRIVER WITH PRIMITIVES IN ROM OR A MODULE TO BE LINKED WITH ANOTHER
; MODULE TO MAKE AN RT11 DRIVER FROM THE ROM PRIMITIVES.
;
; AUTHOR:
;
;   BILL CLOGHERVERSION 1
;   DARRELL DUFFY   VERSION 2 27-APR-78
;
; MODIFIED BY:
;   BARBARA DOERRE
;   23-AUG-78   SINGLE MODULE RT11 DRIVER
;   DENISE LANGLAIS
;   29-JUN-79   REMOVE 'DEVICE DRIVER LIST' (R5) AND IMPURE AREA (R4)
;   1-AUG-79ADD DUAL CONTROLLER CODE AND SET OPTIONS
;-

.SBTTL  MACROS AND DEFINITIONS

.MCALL  .DRDEF, .MTPS,  .ASSUME .ADDR

; DD IS CONTROLLED VIA A SERIAL LINE OF DL TYPE
; CONTROL REGISTERS ARE THEREFORE A DL

.IIF NDF DD$PRI DD$PRI  = 4 ;STANDARD PRIORITY FOR DL

.IIF NDF DDT$O  DDT$O   = 0 ;DEFAULT TO SINGLE CONTROLLER

.IIF NDF DD$CS2 DD$CS2  = 176510 ;DEFAULT CSR FOR SECOND CONTROLLER
.IIF NDF DD$VC2 DD$VC2  = 310   ;DEFAULT VECTOR

.DRDEF  DD,34,FILST$,512.,176500,300
.IIF EQ MMG$T   .DRPTR
.IIF NE MMG$T   .DRPTR  FETCH=*NO*
.DREST  CLASS=DVC.DK

.IIF NDF EIS$I  EIS$I = MMG$T
.IIF EQ EIS$I   .MCALL  SOB ; USE SOB INSTRUCTION UNDER XM

;THE FOLLOWING LIST OF SYMBOLICS WERE DELETED SINCE ACCESS TO THE CSR'S
;IS THROUGH A LIST OF THEIR ADDRESSES (@TICSRA AS OPPOSED TO @#TI$CSR)
;TI$CSR =: DD$CSR   ;INPUT CONTROL AND STATUS
;TI$BFR =: TI$CSR+2 ;INPUT BUFFER
;TO$CSR =: TI$CSR+4 ;OUTPUT CONTROL
;TO$BFR =: TI$CSR+6 ;OUTPUT BUFFER
;TI$VEC =: DD$VEC   ;INPUT VECTOR
;TO$VEC =: TI$VEC+4 ;OUTPUT VECTOR

CS$INT  =: 100  ;CONTROL INTERRUPT ENABLE
CS$BRK  =: 1;CONTROL BREAK ENABLE

; ERROR LOG VALUES

DDCNT   =: 8.   ;RETRY COUNT
DDNREG  =: 10.  ;COUNT OF REGISTERS REPORT TO EL

; RADIAL SERIAL 

Re: Vintage Computer stuff on EBAY.DE

[Eric Christopherson via cctalk]

On Fri, Mar 10, 2017 at 1:34 PM, Eric Christopherson <
echristopher...@gmail.com> wrote:

> Hi, Martin.
>
> On Fri, Mar 10, 2017 at 1:24 AM, Martin Meiner via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> Hello friends of vintage computing,
>>
>> As I need the space at home, I am parting from some of my vintage gear.
>> They have all been listed on EBAY.DE.
>> Among others, there are two PDP11 V03 systems, a number of CRT terminals
>> and others. Have a look and see if you find something of interest.
>> Head over to EBAY.DE and search for "PDP11 V03", and then see all my
>> other actions.
>> Just thought I'd let you know..
>>
>
> I'm trying to pull up your ADM-3A (222434344378) on the US eBay site, but
> it's not showing up there. Do you know why that is?
>
> (I've never bought from a foreign eBay domain, so I'm not sure if I can
> just log in there as I would on the US site, watch items, etc., and have it
> all propagate from one domain to the other.)
>

Oh, I see it's for local pickup only (and you seem to be in Switzerland),
or maybe shipping to Germany:
"Möglicherweise kein Versand nach Vereinigte Staaten von Amerika - Lesen
Sie die Artikelbeschreibung oder kontaktieren Sie den Verkäufer, um
Informationen zu Versandoptionen zu erhalten."
translation via Google:
"No shipping to United States of America - Read the item description or
contact the seller for shipping information."

and:

"Da die Wahre raus muss, verkaufe ich den Gegenstand für Selbstabholer
(oder Transport vom Käufer selber organisiert) ab EUR 1 ohne Mindestpreis."
translation via Google:
"Since the truth must go out, I sell the object for self-pickup (or
transport organized by the buyer itself) from EUR 1 without a minimum
price."

-- 
Eric Christopherson

Re: Tape reel data recovery from MERA-400 polish computer

[Paul Koning via cctalk]

> On Mar 10, 2017, at 2:25 PM, Chuck Guzis via cctalk  
> wrote:
> 
> On 03/10/2017 10:58 AM, Paul Koning via cctalk wrote:
>> 
>>> On Mar 10, 2017, at 1:39 PM, Al Kossow via cctalk
>>>  wrote:
>>> 
>>> 
>>> The next extension is to track the tachometer values so that you
>>> can detect and compensate for tape stick/drag which is absolutely
>>> critical for formats that don't self-clock, like NRZI.
>> 
>> NRZI is not self clocking if you consider an individual track in
>> isolation.  But it IS if you consider all the tracks at the same
>> time, provided either (a) the data is recorded with odd parity, or
>> (b) the all-zeroes data character isn't used.  (a) is the case for
>> 9-track tapes.  7 track tapes may be even parity, but that case seems
>> to apply by convention only to text data (not binary data) and there,
>> (b) applies.  You do have to correct for track skew in this process,
>> but that applies in any case even if you have an independent
>> authoritative bit clock.
>> 
>> It clearly can help to have tach signals as a way to improve bit
>> framing, but I don't see that it's mandatory.
> 
> I think I mentioned that a couple of years ago.  Even parity 7 track
> tapes were used on very old systems for reasons that escape me.  One of
> the problems, then was how to represent an all-zero character, since
> there would be no transitions in that particular frame.

Sure.  One tape document I looked at mentions the use of odd parity on the 
7-track tapes when writing binary data, even parity when writing "IBM BCD" 
character coded data, with one of the 6-bit values forbidden in that case (the 
value encoded on tape as 6 zero bits). 

A stretch with no transitions occurs of course at the block boundary (the gap). 
 It also apparently occurs in other spots, for a few bit times: tape marks seem 
to consist of two frames separated by a few clocks worth of blank space.  Ditto 
between data and block check frame(s), if I remember right.

> A tach signal is useful for adjusting the width of the "window" when
> deskewing.

Yes, that was my point: useful to make the process easier or to improve the 
quality of the result if the inputs are marginal, but you can make it work 
without a tach signal.

> I wonder if there's not a better way to attack the problem with some
> simple hardware.   The original posters mentioned an AVR Arduino as
> their initial platform, but cheap SBCs are available that run much, much
> faster.  Consider, for example, the RPi zero or the Orange Pi zero or a
> host other sub-$10 hosts running at a GHz or more.
> 
> You'd need level-shifting for a modern MCU/CPU anyway, as logic levels
> are most commonly 3.3V, not 5V.

Al's mention of that Saleae device fits there: you could plug that into any 
suitable fast enough computer, and it deals with analog data so you can do the 
threshold in software.  (Thanks Al, those look like nice devices.)

paul

Re: Vintage Computer stuff on EBAY.DE

[Eric Christopherson via cctalk]

Hi, Martin.

On Fri, Mar 10, 2017 at 1:24 AM, Martin Meiner via cctalk <
cctalk@classiccmp.org> wrote:

> Hello friends of vintage computing,
>
> As I need the space at home, I am parting from some of my vintage gear.
> They have all been listed on EBAY.DE.
> Among others, there are two PDP11 V03 systems, a number of CRT terminals
> and others. Have a look and see if you find something of interest.
> Head over to EBAY.DE and search for "PDP11 V03", and then see all my
> other actions.
> Just thought I'd let you know..
>

I'm trying to pull up your ADM-3A (222434344378) on the US eBay site, but
it's not showing up there. Do you know why that is?

(I've never bought from a foreign eBay domain, so I'm not sure if I can
just log in there as I would on the US site, watch items, etc., and have it
all propagate from one domain to the other.)

-- 
Eric Christopherson

Re: Tape reel data recovery from MERA-400 polish computer

[Chuck Guzis via cctalk]

On 03/10/2017 10:58 AM, Paul Koning via cctalk wrote:
> 
>> On Mar 10, 2017, at 1:39 PM, Al Kossow via cctalk
>>  wrote:
>> 
>> 
>> The next extension is to track the tachometer values so that you
>> can detect and compensate for tape stick/drag which is absolutely
>> critical for formats that don't self-clock, like NRZI.
> 
> NRZI is not self clocking if you consider an individual track in
> isolation.  But it IS if you consider all the tracks at the same
> time, provided either (a) the data is recorded with odd parity, or
> (b) the all-zeroes data character isn't used.  (a) is the case for
> 9-track tapes.  7 track tapes may be even parity, but that case seems
> to apply by convention only to text data (not binary data) and there,
> (b) applies.  You do have to correct for track skew in this process,
> but that applies in any case even if you have an independent
> authoritative bit clock.
> 
> It clearly can help to have tach signals as a way to improve bit
> framing, but I don't see that it's mandatory.

I think I mentioned that a couple of years ago.  Even parity 7 track
tapes were used on very old systems for reasons that escape me.  One of
the problems, then was how to represent an all-zero character, since
there would be no transitions in that particular frame.

A tach signal is useful for adjusting the width of the "window" when
deskewing.

I wonder if there's not a better way to attack the problem with some
simple hardware.   The original posters mentioned an AVR Arduino as
their initial platform, but cheap SBCs are available that run much, much
faster.  Consider, for example, the RPi zero or the Orange Pi zero or a
host other sub-$10 hosts running at a GHz or more.

You'd need level-shifting for a modern MCU/CPU anyway, as logic levels
are most commonly 3.3V, not 5V.

--Chuck

Re: HP 9815A

[Tony Duell via cctalk]

On Fri, Mar 10, 2017 at 5:15 PM, Jay West via cctalk
 wrote:
> Local electronics place has a HP 9815A for sale, the appearance from a 10
> foot distance was "fair" or slightly less than fair condition. If someone is
> serious about it, let me know and I'll inquire further.
>

No I don't want to try and get it over here...

This machine is interesting from at least 2 respects. It is, IMHO the
only HP desktop
machine to be truely RPN. It has the 4 level stack with automatic
lift/drop like the
handhelds. The older HP desktops with the 3 level stack (9100, 9810) don't have
automatic lift and drop so in my opinion are not true RPN machines.

The other interesting aspect is that this is the only HP desktop calculator (as
opposed to computer) to use a standard microprocessor. Earlier machines
used a TTL-based bit-serial thing, slightlty later ones (HP9825, etc) used an
HP custom processor. But the 9815 has a 6800 in it.


-tony

Re: Tape reel data recovery from MERA-400 polish computer

[Paul Koning via cctalk]

> On Mar 10, 2017, at 1:39 PM, Al Kossow via cctalk  
> wrote:
> 
> 
> The next extension is to track the tachometer values so that you can detect 
> and compensate for tape stick/drag
> which is absolutely critical for formats that don't self-clock, like NRZI.

NRZI is not self clocking if you consider an individual track in isolation.  
But it IS if you consider all the tracks at the same time, provided either (a) 
the data is recorded with odd parity, or (b) the all-zeroes data character 
isn't used.  (a) is the case for 9-track tapes.  7 track tapes may be even 
parity, but that case seems to apply by convention only to text data (not 
binary data) and there, (b) applies.  You do have to correct for track skew in 
this process, but that applies in any case even if you have an independent 
authoritative bit clock.

It clearly can help to have tach signals as a way to improve bit framing, but I 
don't see that it's mandatory.

paul

Re: Tape reel data recovery from MERA-400 polish computer

[Al Kossow via cctalk]

The next extension is to track the tachometer values so that you can detect and 
compensate for tape stick/drag
which is absolutely critical for formats that don't self-clock, like NRZI.

Fortunately, they mention that the tapes they worked with were in good 
condition.

The killer problem with the Qualstar is the reel motors are low torque. If you 
get a sticky tape, the RPMs go wonky.

Good news is the Saleae 16 can do digital and analog capture.


On 3/10/17 10:22 AM, Paul Koning via cctalk wrote:

> The software mentioned in the article sounds very interesting.  It talks 
> about starting with digital data streams from the 9 heads, but adds that you 
> can start with analog data too.  That would be a small change: you'd 
> basically have to add the slicer in software.  That's potentially valuable, 
> if the signals are marginal so the threshold needs to adjust on the fly.
> 
> Obviously this can also be adapted to other tape formats, for example 7 track 
> tapes.  Or esoteric stuff like 10 track tapes.
> 
> Thanks for that link!
> 
>   paul
> 

Re: Tape reel data recovery from MERA-400 polish computer

[Paul Koning via cctalk]

> On Mar 9, 2017, at 10:10 AM, Liam Proven via cctalk  
> wrote:
> 
> http://museo.freaknet.org/en/recupero-dati-nastri-magnetici-del-computer-polacco-mera-400/

Neat.

The software mentioned in the article sounds very interesting.  It talks about 
starting with digital data streams from the 9 heads, but adds that you can 
start with analog data too.  That would be a small change: you'd basically have 
to add the slicer in software.  That's potentially valuable, if the signals are 
marginal so the threshold needs to adjust on the fly.

Obviously this can also be adapted to other tape formats, for example 7 track 
tapes.  Or esoteric stuff like 10 track tapes.

Thanks for that link!

paul

Re: Tape reel data recovery from MERA-400 polish computer

[Al Kossow via cctalk]

Spinning at 50ips probably helped instead of the default 20

I would have digitized the tach signal too, but luckily it wasn't needed

Sad neither you or I are mentioned in the credits

I'm going to try it as well, since I have all the hw to try it out.

On 3/10/17 10:16 AM, Chuck Guzis via cctalk wrote:
> On 03/10/2017 09:59 AM, Al Kossow via cctalk wrote:
>> This is fsckin cool. Chuck and I were wondering how it turned out.
>>
>> On 3/9/17 7:10 AM, Liam Proven via cctalk wrote:
>>> http://museo.freaknet.org/en/recupero-dati-nastri-magnetici-del-computer-polacco-mera-400/
> 
> That's pretty amazing, considering the crappy nature of those Qualstar
> drives.
> 
> I may give it a try.
> 
> --Chuck
> 

Re: Tape reel data recovery from MERA-400 polish computer

[Chuck Guzis via cctalk]

On 03/10/2017 09:59 AM, Al Kossow via cctalk wrote:
> This is fsckin cool. Chuck and I were wondering how it turned out.
> 
> On 3/9/17 7:10 AM, Liam Proven via cctalk wrote:
>> http://museo.freaknet.org/en/recupero-dati-nastri-magnetici-del-computer-polacco-mera-400/

That's pretty amazing, considering the crappy nature of those Qualstar
drives.

I may give it a try.

--Chuck

Vintage Computer stuff on EBAY.DE

[Martin Meiner via cctalk]

Hello friends of vintage computing, 

As I need the space at home, I am parting from some of my vintage gear. They 
have all been listed on EBAY.DE. 
Among others, there are two PDP11 V03 systems, a number of CRT terminals and 
others. Have a look and see if you find something of interest. 
Head over to EBAY.DE and search for "PDP11 V03", and then see all my other 
actions. 
Just thought I'd let you know.. 

Martin 

Re: RT-11 5.x install tapes?

[Zane Healy via cctalk]

I booted up RT-11 5.6, my install was done from original 5.6 floppies.  I don’t 
find any sign of the DD driver, that could be because my /73 doesn’t have a 
TU58 drive, and I’m not sure where the floppies are right now.  Booting 5.7 I 
find DD.MAC, my 5.7 install was from an original tape.

Zane



> On Mar 8, 2017, at 10:26 AM, Jörg Hoppe via cctech  
> wrote:
> 
> Hi all,
> 
> for work on TU58 emulator "tu58fs" I'd like to experiment with oversized tape 
> images under RT-11 5.5, 5.6 and 5.7.
> The images I know about are the classiccmp collections, Earl Evans pointed me 
> to the RT11DV50.ISO archive.
> 
> However, in these images the TU58 driver files DD.MAC/DD.SYS/DDX.SYS are 
> mostly missing.
> Strange, because they claim to be pristine.
> 
> Somebody knows about original RT-11 V5 installation tape images?
> 
> Thanks,
> Joerg
> 

Re: Tektronix Terminal Emulation

[Randy Dawson via cctalk]

xterm will do your Tek 4014 emulation.


There should be lots of Tek stuff in X11, they were one of the original 
consortium members.


While you are fishing around for software to run, I have MOVIE.BYU from one of 
the guys here.


ISSCO's DISPLA should be around, but I have not found it.


Look on youtube, there are a bunch of of clips of folks doing just what you are 
about to do.


Randy



From: cctalk  on behalf of Douglas Taylor via 
cctalk 
Sent: Thursday, March 9, 2017 7:00 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Tektronix Terminal Emulation

I'm trying to return to the computing days of yesteryear when people
hooked graphics terminals to VAXes.

I don't have a Tektronix graphics terminal but I do have a MicroVax II
and a laptop running Debian Linux.  Up to now I've been using the laptop
as a console device and connecting to the Vax using minicom.  I thought
that the laptop would be a natural as a Tektronix type terminal.

On the MicroVax I have just started with PGPLOT and MIIPS, which are
scientific plotting packages that run on Vaxes.

I would like to use the laptop to emulate a Tek terminal connected to
the Vax through a serial port, but there doesn't seem to be anything
available to do that.  Does anyone know of such a thing?

Doug

Re: Tektronix Terminal Emulation

[Jon Elson via cctalk]

On 03/09/2017 09:00 PM, Douglas Taylor via cctalk wrote:
I'm trying to return to the computing days of yesteryear 
when people hooked graphics terminals to VAXes.


I don't have a Tektronix graphics terminal but I do have a 
MicroVax II and a laptop running Debian Linux.  Up to now 
I've been using the laptop as a console device and 
connecting to the Vax using minicom.  I thought that the 
laptop would be a natural as a Tektronix type terminal.


On the MicroVax I have just started with PGPLOT and MIIPS, 
which are scientific plotting packages that run on Vaxes.


I would like to use the laptop to emulate a Tek terminal 
connected to the Vax through a serial port, but there 
doesn't seem to be anything available to do that.  Does 
anyone know of such a thing
Hmmm, seems to me the VCB01 and DecWindows would emulate a 
Tek terminal in the terminal window.  I don't think you had 
to add any software to make that work.


Also, seems a VT220 or a bunch of other terminals would do 
Tek 4010/4012 emulation.  Lear Sigler ADM36, GraphOn come to 
mind.


Jon

Re: Tape reel data recovery from MERA-400 polish computer

[Al Kossow via cctalk]

This is fsckin cool.
Chuck and I were wondering how it turned out.

On 3/9/17 7:10 AM, Liam Proven via cctalk wrote:
> http://museo.freaknet.org/en/recupero-dati-nastri-magnetici-del-computer-polacco-mera-400/
> 

Re: Looking to re-home some NeXT hardware

[Ed via cctalk]

let  me  put  my name  back in the hat  for  the  cube  next  computer...
all the other stuff  we have looks  ok  but  appears  like our  cube may 
have met a baseball bat on part of  it
 
poor thing  would  not  look  good in a   display.
Ed Sharpe archivist  for SMECC
 
 
In a message dated 3/10/2017 10:13:29 A.M. US Mountain Standard Time,  
cctalk@classiccmp.org writes:

On 9  March 2017 at 01:21, Ian Finder via cctalk   
wrote:
> Is someone testing a Markov chainer on the list? If so, you  have some 
more
> work to do...


It would explain the resolute  & total failure of our efforts to
explain top-quoting to him. Er, to  it.

-- 
Liam Proven • Profile: https://about.me/liamproven
Email:  lpro...@cix.co.uk • Google Mail/Talk/Plus:  lpro...@gmail.com
Twitter/Facebook/Flickr: lproven •  Skype/LinkedIn/AIM/Yahoo: liamproven
UK: +44 7939-087884 •  ČR/WhatsApp/Telegram/Signal: +420 702 829  053

HP 9815A

[Jay West via cctalk]

Local electronics place has a HP 9815A for sale, the appearance from a 10
foot distance was "fair" or slightly less than fair condition. If someone is
serious about it, let me know and I'll inquire further.

 

J

Re: 10x life size sculpture of a ZX Spectrum PCB

[Adrian Graham via cctalk]

On 09/03/2017 13:20, "Liam Proven via cctalk"  wrote:

> Since, to my pleased surprise, this has been a runaway hit on
> Facebook, I thought I'd reshare it here.
> 
> My friend Roger took a picture of this sculpture at the Jerwood
> Gallery in Hastings on the south coast of England:
> 
> https://www.flickr.com/photos/25143643@N07/32505083723
> 
> It's a piece called "A Mystery to Myself" by Keith Tyson.
> 
> http://keithtyson.com/work/a-mystery-to-myself/
> 
> There are more pictures from this showing at a different galley:
> 
> http://www.davidrisleygallery.com/exhibitions/keith-tyson2

Nice attention to detail there but who's going to tell him the wiring on his
modulator looks odd :D

-- 
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?

Re: Borrowing a ADF scanner near Orangeburg SC next week?

[Ian Finder via cctalk]

Disregard. Purchased an Epson ES400. Fits in a carry on. Cute little thing.

Expect many GRiD Compass OS docs soon.

On Thu, Mar 9, 2017 at 18:56 Ian Finder  wrote:

> I'm going on an archiving trip to preserve a deserving piece of computer
> history, but it turns out the scanner I'm borrowing is overweight and
> united will charge $100-200 to check it each way.
>
> Before I buy one off amazon, I wanted to see if anyone on the list was
> local and could let us borrow one Tuesday-Friday.
>
> Looking for a heavy duty, double sided ADF deal.
>
> Thanks,
>
> - Ian
> --
>Ian Finder
>(206) 395-MIPS
>ian.fin...@gmail.com
>
-- 
   Ian Finder
   (206) 395-MIPS
   ian.fin...@gmail.com

Re: I hate the new mail system

[Pete Turnbull via cctalk]

On 09/03/2017 07:25, Tor Arntsen wrote:


I did an strace and I can confirm that the Linux 'whois' client that I
used from those various sites sends '-T dn' (or actually -T dn,ace)

   write(3, "-T dn,ace uni-stuttgart.de\r\n", 28) = 28

I can't see where this whois originates from, it has version number
'5.2.'. Its man page refers to RFC 3912, but RFC 3912 says
nothing about -T.  RFC 3912's single example wouldn't have worked in
this case. So I wonder what replaced RFC 3912, and why there's a
mismatch between documentation and functionality.


RFC 3912 is still the current RFC for whois; it's not been replaced.

But there are two other related information systems, Rwhois (Referral 
whois, RFC1714, RFC2167) and whois++ (structured whois, RFC1835, 
RFC1913, RFC1914).  They're more sophisticated, of course, but I don't 
know of any real-life examples and references I've found suggest they 
were never deployed.


Rwhois runs on port 4321 by default and its syntax is nothing like that 
used by DENIC, while whois++ runs on port 63.  Being an extension to 
provide structured responses to a range of template-based queries (it 
too can perform recursive queries on behalf of a client, like rwhois), 
its syntax also looks nothing like normal whois or that used by DENIC.


However, one of the above-mentioned RFCs does comment, wrt whois, that 
"Unfortunately, these additions and extensions have been done in an ad 
hoc and uncoordinated manner."  Uh-huh :-)


--
Pete
Pete Turnbull

Re: Looking to re-home some NeXT hardware

[Liam Proven via cctalk]

On 9 March 2017 at 01:21, Ian Finder via cctalk  wrote:
> Is someone testing a Markov chainer on the list? If so, you have some more
> work to do...


It would explain the resolute & total failure of our efforts to
explain top-quoting to him. Er, to it.

-- 
Liam Proven • Profile: https://about.me/liamproven
Email: lpro...@cix.co.uk • Google Mail/Talk/Plus: lpro...@gmail.com
Twitter/Facebook/Flickr: lproven • Skype/LinkedIn/AIM/Yahoo: liamproven
UK: +44 7939-087884 • ČR/WhatsApp/Telegram/Signal: +420 702 829 053

Re: Full immersion emulation

[Ray Arachelian via cctalk]

On 03/02/2017 08:30 AM, Liam Proven via cctalk wrote:
>
> A short list of shipping products that do that:
>
> Amazon Echo
> https://www.amazon.co.uk/dp/B01GAGVIE4/
>
> Google Home
> https://madeby.google.com/home/
>
> Microsoft Cortana
> https://www.microsoft.com/en-us/windows/cortana
>
Now that the cat's out of the bag, how soon before you can tell your
smart TV "Dear CIA, I'm hungry, can you send over a pizza pls, k thx bye"

LMI Lambda - Software this time

[Daniel Seagraves via cctalk]

Great progress has been made in running the Lambda firmware and diagnostics. A 
way has been found to structure things such that the emulator is releasable 
without infringing on anyone’s copyrights. Now what we need is software tapes, 
specifically a Lisp distribution tape of any version.

If anyone has any tapes in any condition, or knows someone who might have 
something, please ask them to consider imaging their tapes, or having them 
imaged.

If you have images of anything that aren’t the images already on bitsavers, I 
would love to hear from you. Even partial or corrupt images are potentially 
useful.

Re: I hate the new mail system

[Christian Corti via cctalk]

On Thu, 9 Mar 2017, Tor Arntsen wrote:

I did an strace and I can confirm that the Linux 'whois' client that I
used from those various sites sends '-T dn' (or actually -T dn,ace)

  write(3, "-T dn,ace uni-stuttgart.de\r\n", 28) = 28

I can't see where this whois originates from, it has version number
'5.2.'. Its man page refers to RFC 3912, but RFC 3912 says
nothing about -T.  RFC 3912's single example wouldn't have worked in
this case. So I wonder what replaced RFC 3912, and why there's a
mismatch between documentation and functionality.


I did a little research on that:
The '-T' option is passed to the whois server, it's not a client option. 
Intelligent or modern clients know what options to pass to the appropriate 
server, in this case '-T dn' to the DENIC whois server.
This option is completely legal and was introduced at DENIC in an attempt 
to better protect the domain holder's privacy (you know, different 
country, different rules). This was many years ago, but it's still there.
RFC 3912 doesn't specify what output the whois server is supposed to send. 
Everybody "assumes" that it should be the complete domain information, but 
that's simply not the case.
Imposing this assumption is what Mouse does, and that is wrong. Heck, I 
could even have a whois server that tells me the current weather forecast 
for a specific request ;-) It is a minimalistic directory service, nothing 
more.


Christian

Re: Borrowing a ADF scanner near Orangeburg SC next week?

[Toby Thain via cctalk]

On 2017-03-09 9:56 PM, Ian Finder via cctalk wrote:

I'm going on an archiving trip to preserve a deserving piece of computer
history, but it turns out the scanner I'm borrowing is overweight and
united will charge $100-200 to check it each way.

Before I buy one off amazon, I wanted to see if anyone on the list was
local and could let us borrow one Tuesday-Friday.

Looking for a heavy duty, double sided ADF deal.


Fwiw, Fujitsu Fi-4530 like I've got does 11x17" ADF or 11x17+" oversize 
(e.g. foldouts), it's fast, fairly compact, and weighs 18.7 lb. 
Recommended without hesitation for binders/documents. I have the USB 
version and I attest you can drive it from Windows 7+ with a bit of 
fiddling (though drivers are originally for XP I believe).


http://www.fujitsu.com/us/products/computing/peripheral/scanners/product/eol/fi4530c/

No, you probably can't buy one from Amazon, but Fujitsu does have a 
newer range that you probably can.


There are quite a few on US Ebay if you can BIN and ship quick enough...

http://www.ebay.ca/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=fujitsu+4530&_sacat=0



--Toby




Thanks,

- Ian

Re: New HP42s clone almost available

[Kyle Owen via cctalk]

That looks quite nice. I wonder what the buttons actually feel like; that
seems to be one thing that HP has been generally unable to recreate since
the 42s and 48GX.

Despite keeping my 49g+ in its leather case, one of the buttons managed to
break from carrying it in my backpack years ago. I've never had that
problem with my 32SII or 48G.

Kyle

10x life size sculpture of a ZX Spectrum PCB

[Liam Proven via cctalk]

Since, to my pleased surprise, this has been a runaway hit on
Facebook, I thought I'd reshare it here.

My friend Roger took a picture of this sculpture at the Jerwood
Gallery in Hastings on the south coast of England:

https://www.flickr.com/photos/25143643@N07/32505083723

It's a piece called "A Mystery to Myself" by Keith Tyson.

http://keithtyson.com/work/a-mystery-to-myself/

There are more pictures from this showing at a different galley:

http://www.davidrisleygallery.com/exhibitions/keith-tyson2

-- 
Liam Proven • Profile: https://about.me/liamproven
Email: lpro...@cix.co.uk • Google Mail/Talk/Plus: lpro...@gmail.com
Twitter/Facebook/Flickr: lproven • Skype/LinkedIn/AIM/Yahoo: liamproven
UK: +44 7939-087884 • ČR/WhatsApp/Telegram/Signal: +420 702 829 053

Re: Full immersion emulation

[Liam Proven via cctalk]

On 9 March 2017 at 17:22, Ray Arachelian  wrote:
>
> Now that the cat's out of the bag, how soon before you can tell your
> smart TV "Dear CIA, I'm hungry, can you send over a pizza pls, k thx bye"

:-D

Or the XCKD version:

https://xkcd.com/1807/


-- 
Liam Proven • Profile: https://about.me/liamproven
Email: lpro...@cix.co.uk • Google Mail/Talk/Plus: lpro...@gmail.com
Twitter/Facebook/Flickr: lproven • Skype/LinkedIn/AIM/Yahoo: liamproven
UK: +44 7939-087884 • ČR/WhatsApp/Telegram/Signal: +420 702 829 053

Borrowing a ADF scanner near Orangeburg SC next week?

[Ian Finder via cctalk]

I'm going on an archiving trip to preserve a deserving piece of computer
history, but it turns out the scanner I'm borrowing is overweight and
united will charge $100-200 to check it each way.

Before I buy one off amazon, I wanted to see if anyone on the list was
local and could let us borrow one Tuesday-Friday.

Looking for a heavy duty, double sided ADF deal.

Thanks,

- Ian
-- 
   Ian Finder
   (206) 395-MIPS
   ian.fin...@gmail.com

Info Needed: DATARAM DR-111 PDP-11 Unibus 16KW Core Memory

[Systems Glitch via cctalk]

Looking for any information and/or documentation on DATARAM DR-111 (assembly 
61101) 16Kx16 core memory boards for the Unibus. I've got four in unknown 
condition, one with a clearly destroyed 8T37.

I have a large format scanner with ADF and can digitize print sets if necessary.

Thanks,
Jonathan

Tektronix Terminal Emulation

[Douglas Taylor via cctalk]

I'm trying to return to the computing days of yesteryear when people 
hooked graphics terminals to VAXes.


I don't have a Tektronix graphics terminal but I do have a MicroVax II 
and a laptop running Debian Linux.  Up to now I've been using the laptop 
as a console device and connecting to the Vax using minicom.  I thought 
that the laptop would be a natural as a Tektronix type terminal.


On the MicroVax I have just started with PGPLOT and MIIPS, which are 
scientific plotting packages that run on Vaxes.


I would like to use the laptop to emulate a Tek terminal connected to 
the Vax through a serial port, but there doesn't seem to be anything 
available to do that.  Does anyone know of such a thing?


Doug

Re: FW: More 8085a oddities

[steven canning via cctalk]

Sorry Adrian I feel like I'm coming in at the end of the movie here . My
code pig ( software guy ) learned the hard way that you ALWAYS need to
start 8085 code with an " F3 "  (HEX ) DI disable interrupts command so
that you can have all your ducks lined up before you get an Interrupt (
whether real or imagined ) otherwise you can jump to some weird a$$ address
that will do something unwanted . Just a thought .

Best regards , Steven

On Sun, Mar 5, 2017 at 10:25 AM, Adrian Graham via cctalk <
cctalk@classiccmp.org> wrote:

> Hi folks,
>
> I didn't see the message at the bottom of this one arrive since I think I
> sent it JUST as the list software was being changed over.
>
> Gah, having just looked again I realise I've sent it from not the address
> I've subbed with. PEBCAK there :)
>
> Since then I discovered the -5V rail for the 4116s had dropped to -4.2V
> which was out of spec for both types of RAM on this box so on Chuck's
> suggestion I swapped the 560ohm resistor/zener combo that was powering this
> rail for a 79L05 regulator and the DRAMs now have all 3 voltages steady.
>
> No change in behaviour though. I'm baffled as to why the upper address bus
> doesn't blip once RESET goes high. HOLD is permanently pulled low so it's
> not that.
>
> Any suggestions?
>
> Cheers!
>
> --
> Adrian/Witchy
> Binary Dinosaurs creator/curator
> Www.binarydinosaurs.co.uk - the UK's biggest private home computer
> collection?
>
> -- Forwarded Message
> From: Adrian Graham 
> Date: Sun, 26 Feb 2017 23:34:50 +
> To: "Discussion: On-Topic and Off-Topic Posts" 
> Conversation: More  8085a oddities
> Subject: More  8085a oddities
>
> Hi folks,
>
> After a few days break I came back to my 8085a-powered phone system this
> weekend and it's decided to go on strike. By that I mean the processor
> locks
> up after only a few cycles so doesn't get as far as attempting to read
> anything, when it freezes the S0/S1/WR status lines are all high which
> shouldn't be possible since S0/S1 high should be 'Fetch' according to the
> manual, not WRITE.
>
> Vcc, RESET and clock are good and I can't see any other external signal
> which might hold the CPU. The PSU is good and putting out +5/+12/-12 as it
> should. CPU checks out in another 8085 system I forgot I had.
>
> Interestingly my analyser shows the upper half of the address bus doesn't
> change while the lower half manages a single transition, as does the ALE
> signal. From the CPU both halves of the address bus go directly to a
> 74LS373
> each which both check out OK on a breadboard circuit I made up earlier.
>
> ROMs are all OK and the lines themselves back to the LS373 and CPU check
> out
> with little resistance.
>
> I'm stumped and can't help but think this is something stupid which I'm
> overlooking. Maybe more sleep will help.
>
> Cheers!
>
> --
> Adrian/Witchy
> Binary Dinosaurs creator/curator
> Www.binarydinosaurs.co.uk - the UK's biggest private home computer
> collection?
>
> -- End of Forwarded Message
>
>
>

New HP42s clone almost available

[David Griffith via cctalk]

There's a Swiss guy who's made a name for himself by producing working 
replicas of classic HP calculators.  See https://www.swissmicros.com/.  I 
recently discovered his post on Youtube a video showing off an enhanced 
replica of my favorite HP calculator, the HP42s.  This one is called the 
DM42.  Here's the video: https://www.youtube.com/watch?v=0LK7JotR728


--
David Griffith
d...@661.org

A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?