Which Dec Emulation is the MOST useful and Versatile?

[Kip Koon via cctalk]

Hi DEC Enthusiast's,

If I were to have to decide on just one model DEC PDP system to run in a DEC
Emulator, which one would be the most useful, versatile and has the most
software available for it?

I have only ever used a real PDP-8/e system way back in high school so I'm
not up to par on any other model of DEC PDP system and I only know BASIC on
the PDP-8/e so not much there either.

I hear a lot about the PDP-11.  I found out that there were 16 major PDP
models at one time so I'm not too sure which one to pick.  

I built Oscar Vermeulen's PiDP-8/I which I'm waiting on 1 part for.  Other
than that project which is in a holding pattern at the moment, I have no
other PDP anything running in any form.

Back in the day when Bill Gates and company 1st started out, I had always
wondered how they developed their very 1st software program - Altair Basic.
I was pleasantly surprised one day when I saw a B/W photo of a young Bill
Gates bending over the operator at what looked like a very small computer.
Maybe it was just a terminal.  I don't remember.  I understand they did
software development on a DEC PDP of some sort.  

Finding this out regenerated my interest in the DEC PDP line of computers.  

I have many projects in the works already so I decided to setup a software
emulation of just one of the DEC PDP models.  I have heard a lot about the
PDP-11 which if the information I read is correct was 16-bits.  My PiDP-8/I
is 12 bits.  I understand the PDP 10 was 36-bits and the PDP-15 was 18-bit.
The PDP-11 is the model I hear the most about.  

I also have some experience on some version of  a VAX when I was in the Air
Force so I'm thinking of getting a VAX emulation going at some point too.

So if I'm going to do this, what suggestions, pointers, experiences,
etcetera do you guys have for me.  I am very interested in the DEC PDP
equipment though next to no experience so I have no basis to make a
decision.  This is a serious request so I would definitely like to hear what
you all have to say.  If you have read this far, thank you.  Take care my
friends.

 

 

Kip Koon

computer...@sc.rr.com

http://www.cocopedia.com/wiki/index.php/User:Computerdoc

 

Re: Cloning A Hard Disk Over The Network Using Ultrix

[Jay Jaeger via cctalk]

On 10/21/2017 5:40 AM, Rob Jarratt via cctech wrote:
> I have a couple of hard disks I want to make dd copies of. I have Ultrix
> running on my DECstation 5000/240 with the disk I want to clone attached to
> it. The trouble is that I don't have enough disk space on the machine to
> clone the disk and then grab the image using FTP. I have been trying to find
> a way to pipe the dd output over the network to a SIMH Ultrix machine that
> has plenty of disk space. I tried piping dd into rcp, but rcp doesn't seem
> to take input from standard input. I have looked at cpio, but that too
> appears not to accept input from standard input.
> 
>  
> 
> Unix is not my strong point. Are there any other ways I could pipe the dd
> output across the network to a machine that has enough disk space?
> 
>  
> 
> Thanks
> 
>  
> 
> Rob
> 
> 

One way would be to attach the drive to an x86 machine that supports the
disk drives, and use clonezilla.

Another way, which I have used, is to use perl or Python to do the job.
They are relatively small, so I just included mine here.

I had trouble with the perl version under Linux at some point, so now on
the Linux side, I use a Python version.  NOTE:  I am not very fluent in
Python.  Also, I don't use the Python server version.


#!/usr/bin/perl
#
#   Simple program for piping output (such as tar) from one system to 
another.
#   Contains client and server in the same script.
#
#   Usage: tcppipe [ -c server [-i file] ] | [ -s [-o file] ] [-p port]
#
#   The client reads standard input by default and sends it to "server" on
"port".
#   The server writes standard output by default.
#
#   Port defaults to 1025
#
#   JRJ  12/95
#

use Getopt::Std;
use Socket;

$debug=1;

$PROGRAM='tcppipe';
$VERSION='V1.0';
$PORT = 4097;

$MTU=65536;
$AF_INET=2;
$SOCK_STREAM=1;
$PF_INET=2;

$sockaddr='S n a4 x8';

#
#   Get and validate options.
#

getopts('c:si:o:p:') || usage();

if(($opt_c && $opt_s) || (!$opt_c && !$opt_s) ||
   ($opt_c && $opt_o) || ($opt_s && $opt_i)) {
usage();
}

if(!$opt_p) {
$opt_p = $PORT;
}

#
#   Call the client or server piece, as appropriate.
#

if($opt_c) {
return(pipe_client($opt_c,$opt_p,$opt_i));
}
else {
return(pipe_server($opt_p,$opt_o));
}

#
#   Client piece
#

sub pipe_client {
local($server,$client_port,$infile) = @_;

if($infile && ! -f $infile) {
die "$0: $infile is not a valid file.\n";
}

#
#   Open the file.  In binary, if you please...
#

if($infile) {
open(INFILE,$infile) || die "$0: Can't open file $infile: $!";
$fd = INFILE;
}
else {
$fd = STDIN;
}
binmode $fd;

if($debug) {
print "Server: $server \n";
}

#
#   Do some work to prepare the socket data structures
#
($pname, $paliases, $proto) = getprotobyname('tcp');
($hname, $haliases, $htype, $hlen, $hip) = gethostbyname($server);
if(!defined($hip)) {
die "$0: Unknown host: $server : $! ";
}
if($debug) {
@nip = unpack('C4',$hip);
print "Host address for $server: @nip \n";
}
$netaddr = pack($sockaddr, $AF_INET, $client_port, $hip);
socket(SERVER,$PF_INET,$SOCK_STREAM,$proto) ||
die "Can't create socket: $!";

#
#   Open the connection to the server.
#
connect(SERVER,$netaddr) || die "Can't connect to server: $!";
select(SERVER); $|=1; select(stdout);
if($debug) {
print "Connected to $server\n";
}

#
#   Server indicates it's name and version
#
$_=;
if($debug) {
print "Server: $_";
}
/^220 $PROGRAM $VERSION\n$/ ||
die "$0: Unexpected server response: $_";

#
#   Send the file.
#
while(read($fd,$buf,$MTU)) {
if($debug) {
print "Read in " . length($buf) . " bytes.\n";
}
print SERVER $buf ||
die "Can't send data to server: $!";
if($debug) {
print "Sent...\n";
}
}

#
#   All done
#
close(SERVER);
close($fd);
print "Transfer completed.\n";
exit 0;
}

#
#   Server piece
#
sub pipe_server {
local($server_port,$outfile) = @_;

#
#   Open the file.  In binary, if you please...
#

if($outfile) {
open(OUTFILE,">$outfile") || die "$0: Can't open file $infile: 
$!";
$fd = OUTFILE;
}
else {
$fd = STDOUT;
}
binmode $fd;

#
#   Do some work to prepare the 

Re: HP 7907 read preamp question

[Jon Elson via cctalk]

On 10/21/2017 12:43 AM, Chuck Guzis via cctalk wrote:
No, it turns out the answer is to set the preamp gain at 
spec. It appears to do nothing but create more problems if 
turned up higher than that. It was worth a try. --Chuck 
Well, then, now you have your answer!  From working with 
tapes and drives a long time ago, I seem to recall that 
unless you had print through, the difference between a 1 and 
a 0 was quite large, so there really was no need to fine 
tune the gain or slicer levels.  If you had varying signal 
amplitudes, it was more likely dirt on the heads, really bad 
tape weave or something crazy like that, and mechanical, and 
not variation in the tape signal itself.


We tried some extended-length tapes that were about half the 
thickness, and quickly saw nasty print through trouble, and 
got rid of all of it.  (This was likely at 1600 BPI, might 
have even been worse at 800 BPI.)


Jon

Re: Fujitsu M2235S

[Jules Richardson via cctalk]

On 10/21/2017 01:31 PM, Phil Blundell via cctalk wrote:

Anybody familiar with the internals of these disks?  I have one here
which seems to have the positioner stuck at track zero.  I'm not sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I am a
bit reluctant to just pull the lid off the chamber to find out.


There appears to be a photo of the internals here, if that helps at all:

http://museum.ipsj.or.jp/computer/device/magnetic_disk/images/0011_03_l.jpg

... it's a little small, so hard to tell what's going on for sure! I don't 
see any obvious locking mechanism, though.


There's a Fujitsu M2333KS on ebay - item # 182218376023 - which appears to 
be quite similar in layout. That one appears to have some form of 
positioner / track 0 sensor accessible from outside the HDA if the logic 
board is removed - is that true of the 2235 too?

Re: Cleaning and Restoring a Badly Corroded PSU

[dwight via cctalk]

I would remove the transformers before putting it in the wash.

The big one doesn't look to be hermetically sealed.

Dwight



From: cctalk  on behalf of Phil Blundell via 
cctalk 
Sent: Monday, October 23, 2017 3:27:29 PM
To: r...@jarratt.me.uk; Rob Jarratt; General Discussion: On-Topic and Off-Topic 
Posts
Subject: Re: Cleaning and Restoring a Badly Corroded PSU

On Mon, 2017-10-23 at 21:45 +0100, Rob Jarratt via cctalk wrote:
> I am now looking at the H7826 PSU that came with a TURBOchannel
> Extender. It
> looks like there may have been capacitor leakage and some heatsinks
> will
> need to be replaced. I have posted pictures here:
>
>
>
> https://robs-old-computers.com/2017/10/23/corroded-h7826-power-supply
> /

Maybe the photos don't do justice to the full horror but it doesn't
look all that bad from what you've posted.

The heatsinks do look a bit corroded but, if they are aluminium (which
I would guess they are from the photos) then this might just be
dampness rather than anything more sinister.  Aluminium does tend to
rot a bit in prolonged contact with water, and if it is also in contact
with steel then you get an electrolytic reaction which can be fairly
ruinous.

I doubt the heatsinks are a standard part you can buy off the shelf.
They have a bit of a custom look about them.  But, unless you are
worried about authenticity of those parts, a standard heatsink from
Farnell etc will work just fine.  If you do want the authentic article
then you might need to get some replacements machined.

As for cleaning the board, given that it seems to be relatively low-
tech I would probably be fairly comfortable putting it in the
dishwasher on a shortish cycle.  Then give it a bit of a rinse with
deionised water and let it dry out.

The caps don't look obviously leaky, and (unlike batteries) it doesn't
seem to be common for capacitors to ooze their electrolyte without
fairly evident physical distress.  But replacing them is probably a
good plan anyway!

p.

Re: Cleaning and Restoring a Badly Corroded PSU

[Phil Blundell via cctalk]

On Mon, 2017-10-23 at 21:45 +0100, Rob Jarratt via cctalk wrote:
> I am now looking at the H7826 PSU that came with a TURBOchannel
> Extender. It
> looks like there may have been capacitor leakage and some heatsinks
> will
> need to be replaced. I have posted pictures here:
> 
>  
> 
> https://robs-old-computers.com/2017/10/23/corroded-h7826-power-supply
> /

Maybe the photos don't do justice to the full horror but it doesn't
look all that bad from what you've posted.

The heatsinks do look a bit corroded but, if they are aluminium (which
I would guess they are from the photos) then this might just be
dampness rather than anything more sinister.  Aluminium does tend to
rot a bit in prolonged contact with water, and if it is also in contact
with steel then you get an electrolytic reaction which can be fairly
ruinous.

I doubt the heatsinks are a standard part you can buy off the shelf. 
They have a bit of a custom look about them.  But, unless you are
worried about authenticity of those parts, a standard heatsink from
Farnell etc will work just fine.  If you do want the authentic article
then you might need to get some replacements machined.

As for cleaning the board, given that it seems to be relatively low-
tech I would probably be fairly comfortable putting it in the
dishwasher on a shortish cycle.  Then give it a bit of a rinse with
deionised water and let it dry out.

The caps don't look obviously leaky, and (unlike batteries) it doesn't
seem to be common for capacitors to ooze their electrolyte without
fairly evident physical distress.  But replacing them is probably a
good plan anyway!

p.

Re: Cleaning and Restoring a Badly Corroded PSU

[Chuck Guzis via cctalk]

On 10/23/2017 01:45 PM, Rob Jarratt via cctalk wrote:
> I am now looking at the H7826 PSU that came with a TURBOchannel Extender. It
> looks like there may have been capacitor leakage and some heatsinks will
> need to be replaced. I have posted pictures here:
> 
>  
> 
> https://robs-old-computers.com/2017/10/23/corroded-h7826-power-supply/

This board actually appears to be in very good condition.  At least it's
not a centimeter deep in hardened mouse poop! (yes, this has happened to
me).

--Chuck

Re: Cleaning and Restoring a Badly Corroded PSU

[dwight via cctalk]

I don't see why you have assumed that one of the capacitors has leaked. The 
corrosion could have come from water or condensation onto the board.

I don't see any corrosion on the components.

Dwight



From: cctalk  on behalf of Rob Jarratt via 
cctalk 
Sent: Monday, October 23, 2017 1:45:42 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Cleaning and Restoring a Badly Corroded PSU

I am now looking at the H7826 PSU that came with a TURBOchannel Extender. It
looks like there may have been capacitor leakage and some heatsinks will
need to be replaced. I have posted pictures here:



https://robs-old-computers.com/2017/10/23/corroded-h7826-power-supply/



So two questions:



1.   Any suggestion on how to clean the board? Some of the corners are a
bit inaccessible to reach with just a cotton bud and isopropyl.

2.   Do those heat sinks have a particular name/spec that I can search
for?



Thanks



Rob

Re: Pine (was: Re: cctalk Digest, Vol 17, Issue 20)

[Christian Corti via cctalk]

On Mon, 23 Oct 2017, Richard Loken wrote:

By gum!  Alpine does indeed translate the 'A' into a '?' and I never
noticed.


I'm using Alpine, too, and have no problems with the à or any other 
foreign character. I'm not even using UTF-8 but plain ISO-8859-1 in my 
terminal.
But it's important to set "Display Character Set" and "Unknown Character 
Set" in Alpine's settings! Otherwise you'll see '?' for all non-ASCII 
characters.


Christian

Re: Fujitsu M2235S

[Tom Uban via cctalk]

It varies from drive to drive, but there is usually a sticker pointing it out,
perhaps on the bottom of the drive, sometimes a screw has to be loosened
in order to slide a bracket, etc.

On 10/23/17 10:24 AM, Phil Blundell via cctalk wrote:
> No, that was what I was thinking of with the "some sort of latch"
> comment.  Where is the head lock?
> Thanks
> Phil
> On Mon, 2017-10-23 at 10:19 -0500, Tom Uban wrote:
>> I assume you've released the head lock?
>>
>> On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
>>> Anybody familiar with the internals of these disks?  I have one
>>> here
>>> which seems to have the positioner stuck at track zero.  I'm not
>>> sure
>>> whether it's likely to be just a bit sticky and in need of some
>>> assistance or whether there is some sort of latch involved, and I
>>> am a
>>> bit reluctant to just pull the lid off the chamber to find out.
>>>
>>> Thanks
>>>
>>> Phil
>>>
>>>
>>

Re: Fujitsu M2235S

[Tom Uban via cctalk]

I assume you've released the head lock?

On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
> Anybody familiar with the internals of these disks?  I have one here
> which seems to have the positioner stuck at track zero.  I'm not sure
> whether it's likely to be just a bit sticky and in need of some
> assistance or whether there is some sort of latch involved, and I am a
> bit reluctant to just pull the lid off the chamber to find out.
>
> Thanks
>
> Phil
>
>

Re: Pine (was: Re: cctalk Digest, Vol 17, Issue 20)

[Eric Christopherson via cctalk]

On Mon, Oct 23, 2017 at 10:32 AM, Richard Loken via cctalk <
cctalk@classiccmp.org> wrote:

> On Sun, 22 Oct 2017, Sean Conner via cctalk wrote:
>
> By gum!  Alpine does indeed translate the 'A' into a '?' and I never
> noticed.  It seems that my tiny mind simply translated the character
> and moved on.
>
>  I have:
>>
>> LANG=en_US.UTF-8
>> LC_COLLATE=C
>>
>> as part of my environment, and I'm using a font that supports UTF-8...
>>
>
> And how does one know that a font supports UTF-8?
>
> And yes UTF-8 has been around for decades but as an English speaker I
> didn't have to think about unicode and locale and stuff like that.


I just joined the SunHelp rescue list a few weeks ago, and I've seen
several places where "curly quotes" get replaced by the letter b plus
another character I can't remember off the top of my head. This seems to be
a problem with their list rather than with mutt. I have to say, though,
that curly quotes are a huge problem encodingwise anyway. (It's always nice
to paste in some source code where the nice clean ASCII quotes have been
converted into matching pairs of curly quotes!)

-- 
Eric Christopherson

Re: Pine (was: Re: cctalk Digest, Vol 17, Issue 20)

[Eric Christopherson via cctalk]

On Sun, Oct 22, 2017 at 3:13 AM, Angel M Alganza via cctalk <
cctalk@classiccmp.org> wrote:

> Hello:
>
> On Fri, Nov 20, 2015 at 01:39:32PM -0600,
> (Yes, almost two years ago.  I'm a bit behind with
> my mail, LOL.) Eric Christopherson wrote:
>
> > I'm considering doing something that actually
> > downloads my Gmail content locally and keeps it
> > in sync periodically, but I haven't really
> > looked at what's necessary for that.
>
> Have a look at mbsync/isync if you still haven't
> done anything about it on those two years.  LOL
> It does exactly what you wanted.
>
> Cheers,
> Ángel
>

Gracias, Ángel.  As a matter of fact I *haven't* done any work on that
front lately. I will be sure to check these out.

I can't remember how long I've been using it (but apparently for at least
two years), but I use Gmail's IMAP via mutt. I know a lot of people like
*pine but when I first started seriously playing around with text-mode
Linux (since I installed it on a system that I figured was too wimpy to
support X) I started using mutt for local and POP/SMTP mail and have always
really liked it.

I use alpine in a shell account on a remote server I use, but I'm always
cursing the way it helpfully offers to automatically archive and/or delete
old messages. I know at least once I've accidentally hit a key giving it
permission to do its thing, with no chance of undoing it. I thought I had
turned that off somehow, but the last time I used it it happened again.

I'm pretty sure the first *nix email client I used was elm. I seem to
remember liking it better than pine, but I don't remember why.

-- 
Eric Christopherson

Re: Pine (was: Re: cctalk Digest, Vol 17, Issue 20)

[Richard Loken via cctalk]

On Sun, 22 Oct 2017, Sean Conner via cctalk wrote:

By gum!  Alpine does indeed translate the 'A' into a '?' and I never
noticed.  It seems that my tiny mind simply translated the character
and moved on.


 I have:

LANG=en_US.UTF-8
LC_COLLATE=C

as part of my environment, and I'm using a font that supports UTF-8...


And how does one know that a font supports UTF-8?

And yes UTF-8 has been around for decades but as an English speaker I didn't 
have to think about unicode and locale and stuff like that.


--
  Richard Loken VE6BSV: "...underneath those tuques we wear,
  Athabasca, Alberta Canada   : our heads are naked!"
  ** rllo...@telus.net ** :- Arthur Black

Re: Fujitsu M2235S

[Phil Blundell via cctalk]

No, that was what I was thinking of with the "some sort of latch"
comment.  Where is the head lock?
Thanks
Phil
On Mon, 2017-10-23 at 10:19 -0500, Tom Uban wrote:
> I assume you've released the head lock?
> 
> On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
> > Anybody familiar with the internals of these disks?  I have one
> > here
> > which seems to have the positioner stuck at track zero.  I'm not
> > sure
> > whether it's likely to be just a bit sticky and in need of some
> > assistance or whether there is some sort of latch involved, and I
> > am a
> > bit reluctant to just pull the lid off the chamber to find out.
> > 
> > Thanks
> > 
> > Phil
> > 
> > 
> 
> 

Re: Pine (was: Re: cctalk Digest, Vol 17, Issue 20)

[geneb via cctalk]

On Sun, 22 Oct 2017, Fred Cisin via cctalk wrote:


I'm considering doing something that actually
downloads my Gmail content locally and keeps it
in sync periodically, but I haven't really
looked at what's necessary for that.


On Sun, 22 Oct 2017, Angel M Alganza via cctalk wrote:

Have a look at mbsync/isync if you still haven't
done anything about it on those two years.  LOL
It does exactly what you wanted.
Cheers,
?ngel

 ^
example

A minor problem - A lot of mail that I receive won't display pro[perly on 
PINE (such as the first letter of your name in your signature!

I end up forwarding some mail FROM PINE, TO GMail to be able to read it!


I have the same issue using Alpine.  Best email anti-virus on the planet 
though. ;)


g.

--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!

RE: Cloning A Hard Disk Over The Network Using Ultrix

[Rob Jarratt via cctalk]

The rsh solution worked for me actually. I used this:

 

dd if=/dev/rrz1c conv=noerror,sync | rsh ult1 dd of=/usr/rz1.dd

 

Where “ult1” was the remote node

 

Thanks

 

Rob

 

From: Huw Davies [mailto:huw.dav...@kerberos.davies.net.au] 
Sent: 23 October 2017 09:32
To: r...@jarratt.me.uk; Rob Jarratt ; General 
Discussion: On-Topic and Off-Topic Posts 
Subject: Re: Cloning A Hard Disk Over The Network Using Ultrix

 

 





On 21 Oct 2017, at 21:40, Rob Jarratt via cctalk  > wrote:

 

I have a couple of hard disks I want to make dd copies of. I have Ultrix
running on my DECstation 5000/240 with the disk I want to clone attached to
it. The trouble is that I don't have enough disk space on the machine to
clone the disk and then grab the image using FTP. I have been trying to find
a way to pipe the dd output over the network to a SIMH Ultrix machine that
has plenty of disk space. I tried piping dd into rcp, but rcp doesn't seem
to take input from standard input. I have looked at cpio, but that too
appears not to accept input from standard input.



Unix is not my strong point. Are there any other ways I could pipe the dd
output across the network to a machine that has enough disk space?

 

netcat (nc) is the usual tool to do this on Unix type systems. Whether it’s 
available for Ultrix I don’t know but it may ‘just compile’.

 

If not, it’s not hard to write two simple programs to read from stdin and 
output to a TCP/IP socket on another host and the second to read from the 
socket and output to stdout.

 

If I had to write the programs I’d either google for an example to copy or have 
a read of Stevens “TCP/IP illustrated” book series - the only risk of reading 
them (there are 3 volumes) is that you can spend 6 months just learning and not 
doing :-)'

 

Huw Davies   | e-mail: huw.dav...@kerberos.davies.net.au 
 

Melbourne| "If soccer was meant to be played in the

Australia| air, the sky would be painted green" 

 

Re: Cloning A Hard Disk Over The Network Using Ultrix

[Christian Corti via cctalk]

On Sat, 21 Oct 2017, Rob Jarratt wrote:


I have a couple of hard disks I want to make dd copies of. I have Ultrix
running on my DECstation 5000/240 with the disk I want to clone attached to
it. The trouble is that I don't have enough disk space on the machine to
clone the disk and then grab the image using FTP. I have been trying to find
a way to pipe the dd output over the network to a SIMH Ultrix machine that
has plenty of disk space. I tried piping dd into rcp, but rcp doesn't seem
to take input from standard input. I have looked at cpio, but that too
appears not to accept input from standard input.


You don't use rcp but rsh (or ssh), for example:
# dd if=/dev/... bs=32768 conv=noerror,sync | rsh otherhost "cat >/dest/path"

You should use a bigger blocksize than the default of 512 bytes, otherwise 
reading will be quite slow...


Or (my preferred way under UNIX), just mount a remote filesystem via NFS 
;-)


Christian

Re: Cloning A Hard Disk Over The Network Using Ultrix

[Huw Davies via cctalk]

> On 21 Oct 2017, at 21:40, Rob Jarratt via cctalk  
> wrote:
> 
> I have a couple of hard disks I want to make dd copies of. I have Ultrix
> running on my DECstation 5000/240 with the disk I want to clone attached to
> it. The trouble is that I don't have enough disk space on the machine to
> clone the disk and then grab the image using FTP. I have been trying to find
> a way to pipe the dd output over the network to a SIMH Ultrix machine that
> has plenty of disk space. I tried piping dd into rcp, but rcp doesn't seem
> to take input from standard input. I have looked at cpio, but that too
> appears not to accept input from standard input.
> 
> 
> 
> Unix is not my strong point. Are there any other ways I could pipe the dd
> output across the network to a machine that has enough disk space?

netcat (nc) is the usual tool to do this on Unix type systems. Whether it’s 
available for Ultrix I don’t know but it may ‘just compile’.

If not, it’s not hard to write two simple programs to read from stdin and 
output to a TCP/IP socket on another host and the second to read from the 
socket and output to stdout.

If I had to write the programs I’d either google for an example to copy or have 
a read of Stevens “TCP/IP illustrated” book series - the only risk of reading 
them (there are 3 volumes) is that you can spend 6 months just learning and not 
doing :-)'

Huw Davies   | e-mail: huw.dav...@kerberos.davies.net.au
Melbourne| "If soccer was meant to be played in the
Australia| air, the sky would be painted green" 

Re: CDP1801

[Brad H via cctalk]

I'm going to put it on my list of projects to create a CPU card for my 
Microtutor that uses the 1802 instead I think.  I can get some blue PCB stock.  
As far as I understand the 1802 is fully backward compatible.
Maybe the 1801s will show up on day.  I've found all kinds of chips I was told 
were impossible to locate.


Sent from my Samsung device

 Original message 
From: Steven Feinsmith  
Date: 2017-10-20  7:32 PM  (GMT-08:00) 
To: Brad H , "General Discussion: On-Topic 
and Off-Topic Posts"  
Subject: Re: CDP1801 

RCA 1801 disappeared from face of Earth forever... You would be better off to 
purchase at:

http://www.sunrise-ev.com/membershipcard.htm to use 1802. The 1802 was very 
successful microprocessor that replaced 1801 because it required to have a pair 
of chips to work together. I believe I saw 1801 was more than 30 years ago.

Good luck!
Steven


On Wed, Oct 18, 2017 at 9:45 PM, Brad H via cctalk  
wrote:
Hi there,







I just purchased an RCA Microtutor minus the rather important CPU card.  I

can recreate the card but I expect locating the 1801 chips will be

difficult.  I am just posting this in various forums in case anyone has any

leads on where I might find either the complete card or the required chips

to make a replacement.  I'm wondering what, if any devices were built with

the 1801 that I might be able to scrounge from.







Thanks again,







B