Hi, all,
I have a question about old Mask-Programmed ROMs
The part in question is the National Semiconductor MM5231. This part is
a 2K-bit PMOS Mask-Programmed ROM, generally organized as 256x8, but
also can be organized (via a MODE pin)as 512x4 bits. In this particular
application, the parts are used as 256x8.
I'm wondering if anyone knows if these particular ROMs (from the '72
timeframe) have a tendency for bit rot over the years?
I know some of the early MOS ROMs had issues with metallization creep
that would cause data loss/corruption.
I have an old calculator that uses these ROMs as the micro and macrocode
stores.
The machine is catatonic, though the power supplies, master clock
oscillator and divider circuitry, and the other obvious stuff are OK.
I suspect it is probably stuck in some kind of microcode loop, just
cycling around doing nothing. I have not yet put logic analyzer on the
microcode latches yet, but that's probably my next experiment.
Sadly, if one or more of these ROMs (there are 18 of them!) has failed,
it likely means that the machine can't be restored to operation, as this
is quite a rare machine, and there just aren't many of them left around.
I have three different EPROM programmers, but sadly, none of them have
the capability to read these parts. I was I had a Data I/O programmer,
but alas, haven't come across one with all the Unipak modules I'd need
at a price I can afford.
Thanks,
-Rick
---
Rick Bensene
The Old Calculator Museum
http://oldcalculatormuseum.com
Hello,
I just acquired two DEC modules, M8295 and M7114.
These appear to be a video system for unibus, named VT30-H.
I don't find any info about these boards...
There's some documentation around?
Is the system complete or some other card is required?
Thanks
Andrea
On Wed, February 17, 2016 06:59, Arno Kletzander wrote:
>> Hi,
>>
>> Is anyone interested in PCS Cadmus/QU68000 systems? We at Hack42 have no
>> idea what to do with them. We need to downsize and these take up a
>> significant amount of our space.
>>
>> See http://dev.ramdyne.nl/IMG_2750.JPG for photograph of the stack.
>>
>> If you know other people who are interested in beasts like these, please
>> pass this information on.
>> --
>> Andreas
>
> Looks like interesting machinery from a German manufacturer!
>
> There is a short blurb about them on de:wp
> (https://de.wikipedia.org/wiki/Cadmus_Workstations) saying the PCS QU68000
> were based on (who'd have guessed...) a 68000 processor on a QBus (!)
> while the later models sold under the CADMUS trademark held 68020/030 and,
> from 1985 on, MIPS RISC processors. They ran MUNIX, a V7 UNIX derivate,
> with some quite sophisticated cluster integration (network boot,
> "Newcastle connection" common superroot namespace, networked block
> devices) enabled by a board called the Intelligent Communications
> Controller.
> The outfit even still seems to stick around here
> (https://www.pcs.com/en/company/history/the-history-of-pcs/), albeit
> manufacturing access/time registration/industrial data terminals nowadays.
>
> As usual, if somebody from Germany conducts an operation on those and
> doesn't know where to put all of them, I'm willing to help out with
> collecting and re-homing. (I may also have an opportunity to collect a
> couple of them in the Netherlands if there are any left by/can be held
> onto until end of May 2016. I'd wish for one of each significantly
> different type but this is not a reservation but a "last resort" deal if
> they'd go to trash otherwise. Basically, if anyone else comes along
> offering a good home for them, I'm happy to stand back.)
>
> TIA,
>
> Arno
>
Yes, those were nice machines. I worked with these systems in '84 - '87
and did visit their premises in Munich a few times. It was a small
office/factory building in the mids of a housing area.
Ed
--
Ik email, dus ik besta.
BTC : 1J5fajt8ptyZ2V1YURj3YJZhe5j3fJVSHN
LTC : LP2WuEmYPbpWUBqMFGJfdm7pdHEW7fKvDz
Hello,
For sale rare PDP 11/45 mini computer
Included:
- TU56 Tape transport
- Cardbuses
- Original DEC Schematics
Accepting offers. Please mail to jasper.wijnands at gmail.com. Located in The
Netherlands.
Kind regards,
Jasper Wijnands
pictures:
[image: undefined]
[image: undefined]
[image: undefined]
[image: undefined]
[image: undefined]
[image: undefined]
1. Anyone who has played with Xerox systems will have encountered the
dreaded 0937 code at boot time; it means "I have been configured for
network operations. I abjure the world and will wait until hell
freezes over before continuing the boot - unless I get the time from a
network time server!"
This is inconvenient and frustrating at times. Netware IPX/SPX is
basically Xerox XNS implemented pretty much unchanged; does anyone
happen to know if a Netware server can provide network time server
functions - and in a way that a Xerox workstation would grok?
2. I haven't powered up my 6085s in a long time - at least 5 years;
maybe 10 for some of them. The results have been most disappointing.
They won't even *start* POST - and/or they give a rolling screen with
no sync - and/or a blank screen - and/or they pass POST but won't boot
with an 0151 error. I've tracked these down in most cases to flaky IOB
boards. These boards hold the system PROMs. Anyone else seen similar
issues? Could it be bit rot in the PROMs? Is that a known thing with
6085s?
Thanks
Mike
Hi,
I'm looking for some old inkjet printers for a legal partner:
Epson Stylus Pro 9000
Epson 9500
Lexmark 7000 Z11
They're from about 1998 or 1999.
They probably have fixed nozzles across the page, no moving head.
Assuming they're of the correct vintage / acceptable, a bounty will be paid.
thanks!
Stan Sieler
sieler at allegro.com
Cupertino, CA
Hi,
We at Hack42 have an Apple Lisa 2/10 for sale at
http://www.ebay.nl/itm/121893065311.
When we powered it up for the last time 18 months ago, it appeared to be
working (no nasty smells etc) but we didn't test it very much. What has
happened since is anybody's guess.
Note: shipping to the US is *really* expensive, but within Europe is
only slightly less painful (with packaging it'll reach 25kg easily).
Pickup is an option.
--
Andreas
Hello all,
I have a bunch of VAX/VMS media that need a new home. I must move them
very soon and I have little time for shipping. Pickup from 53714
(Madison, Wi) preferred.
16MT9:
VMS V5.3 BIN 1/2 & 2/2 in shipping box with docs
VMS V5.3.1 BIN
8" floppy media:
VAX/VMS 3.4 5 disks
VAX/VMS 3.6
VAX/VMS 3.7
VAX/VMS 4.0 3 disks
VAX/VMS V4.1 UPD BIN 4 disks
VAX/VMS V4.2 BIN RX01 MANDATORY UPDATE
VAX FORTRAN 3.4
VAX PASCAL 2.3
Microfiche:
VAX/VMS 3.6 SRC LST
VAX/VMS 4.2 SRC LST
-Jon
Howdy.
I connected one of theese (i have two) to an PC last night.
Blemishes:
the text is blurry
wrong color tones (a little bit red)
so how much can i do with the display picture setting buttons ?
I'm thinking about connecting one of them to a Sun 10 (but i do have a
bunch of RS 6000 PPC machines.)