test-drb December 2004

test-drb@ccmp.vtda.org

243 participants
530 discussions

by cb＠mythtech.net

>No systems that shipped used EDO. We went from FPM to SDRAM. Not entirely accurate... although the ones I was thinking of don't use EDO anyway (my memory told me the 660AV and 840AV required EDO memory installed in pairs... I just looked it up and it appears I'm wrong, they don't care). However, there ARE Macs that require EDO (according to Apple), but upon looking that up, it looks like it may only be DIMM based machines, so it still wouldn't apply to this instance (where I said there were some that required EDO 72 pin SIMMs). So you are correct, it appears that there are no 72 pin simm based units that require EDO, however, EDO is required in some Macs that use DIMMs (which as everyone knows is NOT the same thing as SDRAM). Specifically, the 4400, 5500, and 6500 require EDO... and the 7200 can NOT use EDO, in fact there is a note saying it may damage the machine. The rest can use FMP or EDO simms or dimms (according to the same chart, the 8100, the system in question, wants FMP but will use EDO as FMP if EDO are installed... which is consistant with what I have found of any other 72 pin SIMM mac I've upgraded) <http://docs.info.apple.com/article.html?artnum=19456> -chris <http://www.mythtech.net>

19 years, 4 months

Powermac 8100/80 RAM question

by aek＠spies.com

Some require EDO -- No systems that shipped used EDO. We went from FPM to SDRAM.

19 years, 4 months

Powermac 8100/80 RAM question

by cb＠mythtech.net

>Ordinary PC-type 72-pin SIMMs should be fine, but I think you need Fast >Page Mode rather than EDO. Based on my findings, I've yet to run into a Mac that can't use EDO. Some require EDO, but so far, all the ones I've played with that are supposed to use FPM, work just fine with EDO instead. (note: I have never upgraded an 8100, so for all I know, that could be the one model that really does care). Again, this is based on 72 pin SIMMs. It seems that Apple's 72 pin SIMM requirements were pretty loose compared to their other memory requirements. -chris <http://www.mythtech.net>

19 years, 4 months

Powermac 8100/80 RAM question

by cb＠mythtech.net

>I have a Powermac 8100/80 that needs a RAM upgrade. Lowendmac.com >says that it can handle 72-pin SIMMs, up to 32MB each. My question is >this: does it take the same 72-pin SIMMs as a PC, or does it require >special "mac-only" SIMMs? Google only showed people still selling the >RAM (for outrageous prices), and I couldn't get actual specs on the >RAM itself. Plain old cheap PC simms work fine. If you can, get non-parity as that was what it really called for, but I have successfully used parity in any mac I've tried (that require 72 pin simms that is... 30 pin ones will NOT work with parity for the most part... there are a few exceptions like the version of the IIci that was specifically designed TO use parity, as well as IIRC, some of the last models to use 30 pin would work with either style). You should be able to pick them up cheap from enough places. One thing in your favor... the Mac isn't very picky about matched simms, so you may be able to buy a bunch from somewhere like 18004memory.com that sells unmatched parts pretty cheap in their clearance section. -chris <http://www.mythtech.net>

19 years, 4 months

DEC: System Industries 9901-6082-A

by jkunz＠unixag-kl.fh-kl.de

Hi. I have a quad Qbus board in front of me. It is labeld "System Industries 9901-6082-A". It has two 40 pin IDC connectors, lots of TTL, four AMD2905, three EPROMs, the usual PALs, ... This is some sort of disk controler according to google. What I didn't find out: Is this the complete controler or is this only a part of a controler? There is a "System Industries 9900". It is a separate 19" rack box containing a SMD (?) controler. It is interfaced to SBI or UniBus or ??? with a bus interface card and ribbon cables. Maybe the card I have is the QBus interface card? -- tsch??, Jochen Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

19 years, 4 months

Defective IBM core memory by frost.

by h.j.stegeman＠hccnet.nl

Hi, I am a happy owner of a IBM System/3. This system was standing unpacked in my garage for more then 10 years waiting to be put back into service. If was stored in perfect working condition. Last week I started to restore my old IBM system/3 to working condition. After solving several problems in the power up sequence the system was ready to be IPL-ed. Immediately I had a processor check. Checks lights indicated storage problems. After investigation I discovered that the several X wires on the core planes where open. These wires are mounted by IBM on a square frame. During a heavy forst period (I live in the Netherlands) while standing in a unheated garage the copper X wires shrink and broke. About 20% of the X wires are broken. None of the Y wires (???). These planes are stacked on top of eachother by IBM and the X/Y wire terminals are welded together. This makes the planes non-accessible to repair the open wires. I now have 2 unit (each 32k) both located in the system defective beyond repair and idem a spare unit of 16k. Any one who has such IBM storage unit available to bring my IBM S/3 back to live...? See http://home.hccnet.nl/h.j.stegeman/32kBSM.jpg Regards Henk Stegeman

19 years, 4 months

Problems with my PDP 11/24 (was:Question about memory boards used n VAX 11/7xx)

by bqt＠Update.UU.SE

On Wed, 29 Dec 2004 "Pierre Gebhardt" <cheri-post(a)web.de> wrote: >>> That's the info I found on the net from a 11/750 FAQ: >>> >>> "National Semiconductor Memory Systems: 1Mb memory boards. These >>> boards have PWB 551109464-002 B >>> PWA 980109464-001 D >>> etched on them. They have a push-button switch for disabling the >>> board, and a spare memory chip in a socket on the board. Board has >>> green and yellow LEDS, which should normally both be on. Disabling >>> the board causes the yellow LED to go out, and the red LED on the >>> L0016 to come on, indicating bad memory configuration." >> >> Those almost certainly aren't UNIBUS memory boards, but are >> 11/750-specific boards. > > Thanks for this information, Patrick. > I guess, I'll have to wait for such a VAX, I haven't one yet ;-) Actually, the memory system in a VAX-11/750 are specific to that model. It's not compatible with the VAX-11/780, nor the 11/730. However, the memory backplane is compatible with the MK11 memory box for the PDP-11/70. Unfortunately, the MK11 controller only deals with 256Kb memory boards. So if you'd like to use these 1 Mb memory boards in an 11/70, you need a small hardware hack, and a small software hack. The hardware hack is to tie four board select lines from the backplane into to address lines for the memory card, and the software hack is to reset all the ECC bits in the high 768K of each card, since the MK11 controller only clears ECC on the low 256K. I have done both of these things on an 11/70 here in the past. Johnny Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt(a)update.uu.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

19 years, 4 months

Cray CS6400 CD on epay

by Innfogra＠aol.com

Don't know what it is but those with Cray CS6400s might be interested. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1247&item=5113304032… =1 Paxton Astoria, OR

19 years, 4 months

LF: Tektronix Model 31 Info AVL: Olivetti Programma 101parts/docs

by dave04a＠dunfield.com

At 23:21 29/12/2004 +0000, you wrote: >> >> Hi Guys, >> >> Just picked up an Tektronix Model 31 desktop calculator. This is a >> fairly old (early 70s) desktop programmable with built in tape storage >> and printer. >> >> Looking for information/documenation on it - all I got was the bare >> unit (which looks to be in good shape). > >It's not much, but somewhere I have the service manual for the 4661 >plotter that was used with this machine. I think at least I could get you >a pinout of the I/O connector if that's of any interest. > >-tony Thanks Tony, If you already have it scanned, I would love a copy, however don't go to the effort of copying it just yet if you have not already done so. I am unlikely to actually use the I/O port in the near future... Btw, checked it over this afternoon and applied power - came right up and everything seems to work - even figured out how to write (and run) a short program on it! Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

19 years, 4 months

What are terminals worth?

by aek＠spies.com

I have a wyse wy-50 and a vt101 in good condition that I need to get rid of... I'm wondering if they're even worth putting on ebay. -- yes, esp if the vt101 has a working power supply. I don't know what is is about late 70's DEC switchers, but just about everything I have now with them in is dead (VT100's, 11/44's, et al)

19 years, 4 months

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test-drb December 2004