> On Aug 14, 2023, at 11:52 AM, Paul Koning via cctalk
> wrote:
>
>
>
>> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>>
>> On 8/14/23 06:07, Paul Koning wrote:
>>
https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control
On 8/14/23 15:42, Fred Cisin via cctalk wrote:
On Mon, 14 Aug 2023, Paul Koning via cctalk wrote:
It's been a while, but I think that RAID originated in
academia, though Cray may well have been one of the
earlier commercial users.
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/6306.html
ht
On Mon, 14 Aug 2023, Paul Koning via cctalk wrote:
It's been a while, but I think that RAID originated in academia, though
Cray may well have been one of the earlier commercial users.
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/6306.html
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/C
> On Aug 14, 2023, at 1:48 PM, Milo Velimirović
> wrote:
>
>
>
>> On Aug 14, 2023, at 11:52 AM, Paul Koning via cctalk
>> wrote:
>>
>>
>>
>>> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>>>
>>> On 8/14/23 06:07, Paul Koning wrote:
>>>
> https://ia800809.us.archive.org/30/it
> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>
> On 8/14/23 06:07, Paul Koning wrote:
>
>>> https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047.pdf
>>
>> That drive was
On 8/14/23 06:07, Paul Koning wrote:
>> https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047.pdf
>
> That drive was the fastest transferring disk, by a large margin, for quite a
>
> On Aug 13, 2023, at 5:55 PM, Chuck Guzis via cctalk
> wrote:
>
> On 8/13/23 12:48, Mike Stein via cctalk wrote:
>> Yup; I think I've got a couple of each type somewhere; don't recall who the
>> other ones were, but two are definitely Canon.
>
> Just a late imitation of the CDC 808 hard dis
On 8/13/23 12:48, Mike Stein via cctalk wrote:
> Yup; I think I've got a couple of each type somewhere; don't recall who the
> other ones were, but two are definitely Canon.
Just a late imitation of the CDC 808 hard disk drive--the difference
being that the 808 could handle several tracks at once
Yup; I think I've got a couple of each type somewhere; don't recall who the
other ones were, but two are definitely Canon.
On Sun, Aug 13, 2023 at 3:22 PM Fred Cisin via cctalk
wrote:
> >> Yes, absolutely. One spindle motor, with a floppy hub on each end, and
> >> two heads on one voice coil po
Theoretically it could be done with only 2 motors--one spindle motor and
one positioner. Probably not the best for performance, but doable.
--Chuck
That is exactly what they did. There is only one stepper motor that
drives both heads. And one drive motor that drives both spindles.
Simple,
Yes, absolutely. One spindle motor, with a floppy hub on each end, and
two heads on one voice coil positioner, one for each floppy. I had one
of those. The performance improvement was VERY marginal. I had to take
out the solenoid that lifted the pad that loaded the media against the
head, the
On 8/13/23 09:43, Jon Elson via cctalk wrote:
> Yes, absolutely. One spindle motor, with a floppy hub on each end, and
> two heads on one voice coil positioner, one for each floppy. I had one
> of those. The performance improvement was VERY marginal. I had to take
> out the solenoid that lifte
On 8/13/23 11:25, Tony Duell via cctalk wrote:
On Sun, Aug 13, 2023 at 5:20 PM Nigel Johnson Ham via cctalk
wrote:
The DEC Rainbow RX50s only have one motor :-)
{being pedantic}
No they don't. They have 2. A permanent-magnet DC motor used to drive
both spindles and a stepper motor used to pos
On Sun, Aug 13, 2023, 10:20 AM Nigel Johnson Ham via cctalk <
cctalk@classiccmp.org> wrote:
> On 2023-08-13 12:18, Warner Losh via cctalk wrote:
> > On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk<
> cctalk@classiccmp.org>
> > wrote:
> >
> >> On 8/13/23 08:39, Nigel Johnson Ham via cctalk wr
On Sun, Aug 13, 2023 at 5:20 PM Nigel Johnson Ham via cctalk
wrote:
> The DEC Rainbow RX50s only have one motor :-)
{being pedantic}
No they don't. They have 2. A permanent-magnet DC motor used to drive
both spindles and a stepper motor used to position both heads.
But I will agree it is a lot
On 2023-08-13 12:18, Warner Losh via cctalk wrote:
On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk
wrote:
On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
You've amplified my point, Fred! When I saw the abomination of
cross-over selects in the cables in the IBM PC, I knew the nee
On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk
wrote:
> On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
>
> > You've amplified my point, Fred! When I saw the abomination of
> > cross-over selects in the cables in the IBM PC, I knew the need for
> > Field Service Engineers was comin
On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
> You've amplified my point, Fred! When I saw the abomination of
> cross-over selects in the cables in the IBM PC, I knew the need for
> Field Service Engineers was coming to an end!
>
> I don't believe anything on Wikipedia anymore. When I
On 2023-08-12 22:30, Fred Cisin via cctalk wrote:
Could y'all clarify for me,
Do you mean "drive 3" and "drive 4" of drives 1-4, or 0-3?
do you mean "DS2" and "DS3" of DS0-DS3, or DS1-DS4?
On Sat, 12 Aug 2023, Nigel Johnson Ham via cctalk wrote:
As far as i know, winchester drive selects have
Could y'all clarify for me,
Do you mean "drive 3" and "drive 4" of drives 1-4, or 0-3?
do you mean "DS2" and "DS3" of DS0-DS3, or DS1-DS4?
On Sat, 12 Aug 2023, Nigel Johnson Ham via cctalk wrote:
As far as i know, winchester drive selects have always been 1-4, at least in
the DEC world!
Refe
As far as i know, winchester drive selects have always been 1-4, at
least in the DEC world!
Reference MP-02259-01 RQDX3 Field Maintenance print set. Also Plessey
DCV54 manual.
I don't know about PCs- I went into teaching when the PC came out 'cos
there wasn't enough money in PCs! I was ge
On August 12, 2023 6:35:35 p.m. EDT, Peter Coghlan via cctalk
wrote:
IIRC I had to jumper the second MFM drive as drive 4. Presumably I should
have made a twist in the cable to allow the second MFM drive to be configured
as drive 3, the same as the first drive.
On Sat, 12 Aug 2023, Nigel Joh
mancer.
Hope it helps
Nigel
On August 12, 2023 6:35:35 p.m. EDT, Peter Coghlan via cctalk
wrote:
>>
>> I have a Gesswein MFM emulator from decromancer.ca; who offer an adaptor
>> that yields a 2nd MFM data connector.
>> I'll use mine in a Microvax 2000. Does any
>
> I have a Gesswein MFM emulator from decromancer.ca; who offer an adaptor
> that yields a 2nd MFM data connector.
> I'll use mine in a Microvax 2000. Does anyone know how to hook it up as
> two MFM drives in a Microvax 2000?
>
> The vendor sold a 1in high ada
I have a Gesswein MFM emulator from decromancer.ca; who offer an adaptor that
yields a 2nd MFM data connector.
I'll use mine in a Microvax 2000. Does anyone know how to hook it up as two
MFM drives in a Microvax 2000?
The vendor sold a 1in high adaptor box, BA40A, with DD50 connectors
> On Jan 24, 2021, at 11:54 AM, Warner Losh via cctalk
> wrote:
>
> On Sun, Jan 24, 2021 at 9:53 AM Cameron Kaiser via cctalk <
> cctalk@classiccmp.org> wrote:
>
> 2. Venix: panic at boot, "Bad access number". That doesn't mean
>> anything
> to me. I wonder if the issue is that Ven
> The Venix/Pro that's in the archives works on all Pros (1.0) but 2.0
> requires the 380.
I should have said what it was running. It is indeed 2.0.
--
personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckai...
On Sun, Jan 24, 2021 at 9:53 AM Cameron Kaiser via cctalk <
cctalk@classiccmp.org> wrote:
> > > > 2. Venix: panic at boot, "Bad access number". That doesn't mean
> anything
> > > > to me. I wonder if the issue is that Venix doesn't support the 380.
> [...]
> > > Venix runs fine on my 380. In fac
> > > 2. Venix: panic at boot, "Bad access number". That doesn't mean anything
> > > to me. I wonder if the issue is that Venix doesn't support the 380.
[...]
> > Venix runs fine on my 380. In fact, it's the only OS installed on it. It has
> > the stock hard disk, though I'd like to convert to so
On 1/24/21 11:40 AM, Chris Zach via cctalk wrote:
Listening to these conversations make me really wish I had not
given my 2 PRO's away.
They are neat, but they are so god-damned slow. Compiles on the pro/380
with an RD52 are 1/4th the speed of an 11/83 with a 330mb ESDI disk.
It's to the poin
> -Original Message-
> From: cctalk On Behalf Of Chris Zach via
> cctalk
> Sent: 24 January 2021 16:40
> To: cctalk@classiccmp.org
> Subject: Re: DEC Pro operating systems and MFM emulator
>
> > Listening to these conversations make me really wish I had not gi
Listening to these conversations make me really wish I had not
given my 2 PRO's away.
They are neat, but they are so god-damned slow. Compiles on the pro/380
with an RD52 are 1/4th the speed of an 11/83 with a 330mb ESDI disk.
It's to the point where I compile on the 83, then upload the result
On 1/24/21 10:38 AM, Paul Koning via cctalk wrote:
On Jan 23, 2021, at 4:00 PM, Cameron Kaiser wrote:
2. Venix: panic at boot, "Bad access number". That doesn't mean anything
to me. I wonder if the issue is that Venix doesn't support the 380.
The Venix image is special. Venix doesn't su
> On Jan 23, 2021, at 4:00 PM, Cameron Kaiser wrote:
>
2. Venix: panic at boot, "Bad access number". That doesn't mean anything
to me. I wonder if the issue is that Venix doesn't support the 380.
>>>
>>> The Venix image is special. Venix doesn't support more than 16 sectors
>>> pe
> > > 2. Venix: panic at boot, "Bad access number". That doesn't mean anything
> > > to me. I wonder if the issue is that Venix doesn't support the 380.
> >
> > The Venix image is special. Venix doesn't support more than 16 sectors
> > per track. You may need to put it on a disk whose geometry i
> On Jan 23, 2021, at 1:54 PM, Warner Losh wrote:
>
>
>
> On Sat, Jan 23, 2021, 11:47 AM Paul Koning via cctalk
> wrote:
> The question was asked (I misplaced the note) if the OS images that are on
> the Xhomer website work with David Gesswein's MFM emulat
On Sat, Jan 23, 2021, 11:47 AM Paul Koning via cctalk
wrote:
> The question was asked (I misplaced the note) if the OS images that are on
> the Xhomer website work with David Gesswein's MFM emulator on real hardware.
>
> You can turn these into emulator data files, provided yo
The question was asked (I misplaced the note) if the OS images that are on the
Xhomer website work with David Gesswein's MFM emulator on real hardware.
You can turn these into emulator data files, provided you have the latest
ext2emu tool that's part of David's software (as of 1
> On Jan 20, 2021, at 8:24 AM, Chris Zach via cctalk
> wrote:
>
>> David pointed out #3 is incorrect. I was thinking of totem-pole drivers,
>> but the drivers in the MFM interface are all open collector. So the usage
>> conflict between RD52 using "drive sel 4" as an output vs. the contro
David pointed out #3 is incorrect. I was thinking of totem-pole drivers, but the drivers
in the MFM interface are all open collector. So the usage conflict between RD52 using
"drive sel 4" as an output vs. the controller also doing that is not actually a
problem at all.
Makes sense: I was a
> On Jan 17, 2021, at 1:35 PM, Paul Koning wrote:
>
>
>
>> On Jan 16, 2021, at 5:32 PM, Paul Koning wrote:
>>
>> I just completed a set of tests of David's MFM emulator on my Pro 380.
>>
>> Summary: everything works right. Very impress
t, on most machines after that, pin 32 is SIDE SELECT. It is used to access
side B of the drive.
On Sun, 17 Jan 2021, Paul Koning wrote:
You seem to be talking about floppy drives. The MFM emulator deals with hard
drives, and the RD50 I mentioned is a hard drive (sold by DEC, 5 MB, the
original hard
s SIDE SELECT. It is used to
> access side B of the drive.
You seem to be talking about floppy drives. The MFM emulator deals with hard
drives, and the RD50 I mentioned is a hard drive (sold by DEC, 5 MB, the
original hard drive for the PDP-11 base Professional series).
paul
On Sun, 17 Jan 2021, Paul Koning via cctalk wrote:
2. RD50s are odd; they use pin 32, which is normally drive select 4, as
an output to indicate "I am an RD50". The software looks for that
signal. So to emulate an RD50, install the jumper for drive select 4
(alongside the one for drive select
> On Jan 16, 2021, at 5:32 PM, Paul Koning wrote:
>
> I just completed a set of tests of David's MFM emulator on my Pro 380.
>
> Summary: everything works right. Very impressive device. My compliments to
> David for an amazing piece of engineering.
>
> Detail
> On 16 Jan 2021, at 22:32, Paul Koning via cctalk
> wrote:
>
> I just completed a set of tests of David's MFM emulator on my Pro 380.
>
> Summary: everything works right. Very impressive device. My compliments to
> David for an amazing piece of engineering.
>
I just completed a set of tests of David's MFM emulator on my Pro 380.
Summary: everything works right. Very impressive device. My compliments to
David for an amazing piece of engineering.
Details:
1. I built and tested it (rev C board) per the instructions and all that worked
nicel
> -Original Message-
> From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of David
> Gesswein
> Sent: 11 September 2016 15:51
> To: cct...@classiccmp.org
> Subject: Next order of MFM emulator/reader baords
>
> I will be ordering another batch of boar
I will be ordering another batch of boards. If you wish to order more
boards email me d...@pdp8online.com with how many and if bare, with surface
mount chips, or fully assembled. If you currently are on the waiting list
you don't need to reply.
Info is here.
http://www.pdp8online.com/mfm/
The pr
x27;s
>> MFM disk emulator. I don't have a functional disk to image and the
>> ZRQCH0 won't cooperate.
>>
>
>
> I just read this:
> https://groups.google.com/forum/#!topic/mfm-discuss/GHfvVBL_HOQ
>
> and this:
> http://www.vcfed.org/forum/showthread.php?
pic/mfm-discuss/GHfvVBL_HOQ
and this:
http://www.vcfed.org/forum/showthread.php?49890-MFM-emulator-zrqch0-and-friends-some-notes
It seems that someone has been successful formatting an image. I haven't
tried myself.
ame hard drive (of 4800 blocks),
I can also use that identical file as a disk image for the MFM emulator
for both Ersatz-11 or SimH as if it was connected to an RQDX3 in
the DEC hardware world EXCEPT that, of course, that disk image
would then appear as a very small MSCP device of just 4800 blocks
a
I am looking for an RQDX3 compatible disk image for Dave Gesswein's
MFM disk emulator. I don't have a functional disk to image and the
ZRQCH0 won't cooperate.
I've been hacking Xerox recently and using Dave's excellent MFM
emulator. I'm making two working bootable images available. One is
Lisp - the 'Lyric' distribution. It boots and works and appears
complete and useful but I haven't explored Lisp enough to grok it.
T
Am 08.10.2015 um 07:12 schrieb Mike Ross:
If this thing is ready for prime time and going to get more widespread
use it would be an excellent idea to start developing a library of
ready-to-run disk images for various machines... perhaps a task best
collated by Bitsavers in their copious free time
On Thu, 8 Oct 2015, Ian Finder wrote:
I was one of the people who built the early rev boards David had.
Ditto
Excellent project, he is the man...
And then some!
Here are a few images for your crazy kids to get started with. I'll be
adding more as they come in: http://x.quaalud.es/images/
r prime time and going to get more widespread
>> >> use it would be an excellent idea to start developing a library of
>> >> ready-to-run disk images for various machines... perhaps a task best
>> >> collated by Bitsavers in their copious free time...?
>> >>
>>
o start developing a library of
> >> ready-to-run disk images for various machines... perhaps a task best
> >> collated by Bitsavers in their copious free time...?
> >>
> >> I've just written to David to order a couple :)
> >>
> >> Mike
> >>
On Thu, Oct 8, 2015 at 5:24 PM, Ali wrote:
>>> Hello All,
>>>
>>> This is just a general shout out and thanks to David (Gesswein) for the
>>> excellent work on the MFM emulator boards. I received both of my fully
>>> assembled emulators today. They arrived
CH is pretty nasty right now. We're trying to use my friend's old basement
office apartment to get this started. He has been there for years and it's
very cheap-- for now.
Seattle has gotten ridiculous, so if the building sells or the rent goes
up, most of the gear will get packed away once again.
On 10/8/15 11:38 AM, Ian Finder wrote:
We do not intend to overlap with a big, professional museum like CHM or LCM.
Rather think of this as a kind of a maker-space for old systems; There is a lot
of interest in Seattle- largely people from the software industry- who would
love to code somethi
I consider below a sort of unspoken goal of all responsible folk in this
hobby, but sadly I have been disappointed on occasion:
> of course making the collection available in an database on the web and
digitising the documentation is one of our goals
On Thu, Oct 8, 2015 at 12:35 PM, simon wrote:
That sounds like the museum we have at hack42.nl. we are a hackerspace
with a enormous collection of old computers but we are not open at
regular times. of course making the collection available in an database
on the web and digitising the documentation is one of our goals (besides
having fun w
That's my pet project at this point.
We are having some issues with the space so it will probably (hopefully) open
as appointment-only early next year.
The idea is to find trustworthy people who we can give access to the space to
so they can see projects thru from end-to-end on these systems- l
On 10/8/15 11:18 AM, Al Kossow wrote:
On 10/8/15 10:07 AM, Ian Finder wrote:
If Al decides these sorts of images belong on bitsavers, I'll go on a full-on
imaging spree and work to improve my information hygiene.
yes, that is the plan. I received one this week as well that I was going to pu
On 10/8/15 10:07 AM, Ian Finder wrote:
If Al decides these sorts of images belong on bitsavers, I'll go on a full-on
imaging spree and work to improve my information hygiene.
yes, that is the plan. I received one this week as well that I was going to put
into an 1186 to make some Koto/Lyric
ello All,
>>
>> This is just a general shout out and thanks to David (Gesswein) for the
>> excellent work on the MFM emulator boards. I received both of my fully
>> assembled emulators today. They arrived professionally packaged and ready to
>> go out of the box. I wis
der a couple :)
Mike
On Thu, Oct 8, 2015 at 5:24 PM, Ali wrote:
> Hello All,
>
> This is just a general shout out and thanks to David (Gesswein) for the
> excellent work on the MFM emulator boards. I received both of my fully
> assembled emulators today. They arrived professionall
On 10/7/15 9:24 PM, Ali wrote:
Hello All,
This is just a general shout out and thanks to David (Gesswein) for the
excellent work on the MFM emulator boards. I received both of my fully
assembled emulators today. They arrived professionally packaged and ready to
go out of the box. I wish more
Hello All,
This is just a general shout out and thanks to David (Gesswein) for the
excellent work on the MFM emulator boards. I received both of my fully
assembled emulators today. They arrived professionally packaged and ready to
go out of the box. I wish more hobby/home brew projects went this
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