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101090 discussions

Old MOS Mask-Programmed ROM forgetfulness?

by rickb＠bensene.com

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

10 years, 2 months

DEC VT30-H info

by shadoooo＠gmail.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

10 years, 2 months

PCS Cadmus/QU68000 systems

by ed＠groenenberg.net

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

10 years, 2 months

PDP-11 COBOL-11 or COBOL-81? (was Re: Anyone have DIBOL-11, CTS-300, or CTS-500?)

by spacewar＠gmail.com

DIBOL-11 seems quite rare these days. Is COBOL-11 or COBOL-81 any easier to find?

10 years, 2 months

For sale PDP 11/45 + TU56 + more

by jasper.wijnands＠gmail.com

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]

10 years, 2 months

Couple of Xerox 6085 questions

by tmfdmike＠gmail.com

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

10 years, 2 months

Looking for printers: Epson Stylus Pro 9000, Epson 9500, Lexmark 7000 Z11

by sieler＠allegro.com

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

10 years, 2 months

Apple Lisa 2/10 for sale

by ramdyne＠gmx.net

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

10 years, 2 months

VAX/VMS media

by auringer＠tds.net

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

10 years, 2 months

IBM (Sony) PowerDisplay 20

by stefan.skoglund＠agj.net

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.)

10 years, 2 months

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