On Thu, Jan 6, 2022, 01:20 Joshua Rice via cctech
wrote:
>
> Not cost effective at nearly $10,000! I understand they're very rare,
> given they were only used for a few years in industry and they're
> clocking on 3/4 of a century old, but even then, that seems an order of
> magnitude or two off t
On Thu, Oct 1, 2020 at 11:54 AM dwight via cctech
wrote:
> It is going to need a lot of contact cleaning.
> The one thing I like is the carry design the Zuse used. Really fast for
> relays but not of much use for solid state.
>
Where is that circuit described?
DEC MK11-B Field Maintenance Print Set, October 1977
http://bitsavers.trailing-edge.com/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf
pages 27 to 36 of the PDF file
On Wed, Apr 8, 2020 at 2:54 PM Eric Smith wrote:
> That stands for "data field too big", i.e., too much data to fit in 4KW.
> That's as opposed to "instruction field", which if too big would mean that
> there's too much code.
> Although I used OS/8 Fortran in the distant past, I never tried to co
On Wed, Apr 8, 2020 at 1:34 PM Bill Degnan via cctech
wrote:
> D.F. TOO BIG INIT
> I'd really like to understand what this error means if
> anyone knows.
>
That stands for "data field too big", i.e., too much data to fit in 4KW.
That's as opposed to "instruction field", which if too big wo
On Thu, Nov 7, 2019, 19:36 Jules Richardson via cctech <
cctech@classiccmp.org> wrote:
> On 11/6/19 12:16 PM, David Coolbear via cctech wrote:
> > M5976-AA KZQSA SCSI Controller Q
>
> Hmm, I could sure use one of those...
>
Be forewarned that a KZQSA isn't a "real" SCSI controller. It's doesn't u
On Thu, Jun 28, 2018 at 8:26 PM, Bill Degnan via cctech <
cctech@classiccmp.org> wrote:
> I have always pointed my grant continuity cards in the same direction as a
> NPG card, with the traces to the left/facing the last slot of the
> backplane. I am 99% sure this is right but I was asked and I j
On Sat, Jun 23, 2018 at 1:16 PM, Stephen Pereira via cctech <
cctech@classiccmp.org> wrote:
> Has anyone here ever seen or ever had fig-FORTH for the 6800 working?
>
In the mid-1980s I know someone with a WaveMate 6800 system. He had
fig-Forth running on FLEX. At the time I was only interested i
On Wed, Apr 18, 2018 at 8:17 PM, Mark J. Blair via cctech <
cctech@classiccmp.org> wrote:
> Some of the future reverse engineering projects I have on my to-do list
> involve the CDP1802 processor, which IDA presently doesn't support. When I
> get to them I'll have to decide whether to use dismantl
On Tue, Jan 30, 2018 at 2:55 PM, Bill Degnan via cctech <
cctech@classiccmp.org> wrote:
> https://retropopplanet.files.wordpress.com/2011/06/vintage-computer.jpg
>
Pavl Zachary
IBM invented computer emulation and introduced it with System/360 in 1964.
They defined it as using special-purpose hardware and/or microcode on a
computer to simulate a different computer.
Anything you run on your x86 (or ARM, MIPS, SPARC, Alpha, etc) does not
meet that definition, and is a simul
On Mon, Jul 31, 2017 at 6:15 PM, Michael Thompson via cctech <
cctech@classiccmp.org> wrote:
> The RICM has an opportunity to get a PDP-8/M (built in Maynard, MA) that is
> in Canada. I remember that there was a discussion on the procedure here,
> but I can't find it with Google.
>
If it is actua
Did you get an actual Firefly (research) board, or a prduction VAXstation
3520/3540 board? I don't think you're likely to find schematics or pinouts
for either, but it's not impossible to find 3520/3540 stuff, while I've
never before heard of anyone encountering any actual Firefly boards in the
wil
On Fri, May 5, 2017 at 3:02 PM, allison via cctech
wrote:
> In the PDP-10 realm not less than a handful Tops10. ITC, more.
>
TOPS-10 doesn't have any filesystems for floppy disks, though the KL10
front-end PDP-11/40 running RSX-20F does, and there are utilities to access
RSX and RT11 filesystems
On Mon, Mar 20, 2017 at 6:46 PM, Win Heagy via cctech wrote:
> The expansion interface hardware manual indicates
> it is an FD1771B-01, but the service manual indicates a couple
> possibilitiesFD1771 A/B -01 -11. Any considerations to look for here?
>
All other things being equal, I'd use t
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