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jeremfg
Pilgrim
Joined: 16 Aug 2010
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evasive
Mobo-fu Master
Joined: 06 May 2001
Posts: 36410
Location: Netherlands, Breda
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 Posted: Sat Aug 21, 2010 1:56 pm Post subject: |
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35-701C or something on the left -> PcPartner/Vtech board.
3 seconds, picture wasn't even fully loaded. I'll hunt down the exact model if possible.
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evasive
Mobo-fu Master
Joined: 06 May 2001
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Location: Netherlands, Breda
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| Posted: Sat Aug 21, 2010 2:20 pm Post subject: |
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hmmm that is going to be harder than I thought. virtually nothing known online before 486 era. will have to dig in the offline archives. may take a few days...
I know I have seen that 710010A pattern before, now which OEM was that...
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fussnfeathers
Mobo-fu Master
Joined: 04 Dec 2008
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Location: Right behind you
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| Posted: Sat Aug 21, 2010 3:24 pm Post subject: |
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A bit before my time, but it might have been an Oki, or perhaps an early Zeinith. Those were the two big boys back then, along with IBM.
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Karlsweldt
Enlightened Master
Joined: 12 Nov 2003
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| Posted: Sat Aug 21, 2010 4:36 pm Post subject: |
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Is the mobo now working or not? I note two possible problems. One is the battery, at the left edge by the processor. The end is bulging, and I note some blue stains on the mobo surface. That battery type is still available, but get it off (unsolder it) now, or the board will be useless. The second problem may be the master crystal (32.0 Mhz). Looks like there are two dents in its cover. That could damage its internal crystal oscillator.
There are two large DIPP chips just below the processor.. those are the BIOS chips, one for "high" the other for "low" bytes. Likely a Phoenix BIOS type. Just above the processor is the socket for the 287 co-processor.
At the top right are some rows with holes.. for adding memory up to 4 megs, but the modules must be the type with 30 separate pins for mounting. Very scarce. SIPP type. On the bottom right corner are the connection pins for the FP lights and switches.
Have seen something very similar to the mobo, a long time back. Will see if I have any old manuals. But on the back of the board, note the label.. with the "LOGIC**" part. Possibly a Logitech or Tectronics issue?
From noting the date code on several chips, it appears to be a 1991 late-year issue. The 286/16 mobos were not made in great quantities.
I did an enhancement of the original top view, and was all over the board. But did not note any other signs of make, only the "9036" numbers between the 2nd and 3rd ISA slots. If anyone wants the enhanced image, I can Email it.. but it is 27.3 megs in size!
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Pette Broad
Black Belt 5th Degree
Joined: 10 Jul 2001
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Location: Flintshire, U.K
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| Posted: Sat Aug 21, 2010 5:06 pm Post subject: |
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Hmm, I don't see any IDE connections, so either it pre dates IDE or is some kind of terminal that ran through a token ring ISA card. Not at all familiar with 286 boards, but I'd say 1990 or earlier.
Pete
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fussnfeathers
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| Posted: Sun Aug 22, 2010 12:07 am Post subject: |
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That's why I was guessing one of those two.
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evasive
Mobo-fu Master
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Location: Netherlands, Breda
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| Posted: Sun Aug 22, 2010 12:41 am Post subject: |
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Laser computers. Which was owned by Vtech. I just went through my own online stuff.
Anyway, as things are now I cannot make a definitive identification, you will need at least 2 exactly same 30pin SIP-modules (memory modules with pins on them) of 1MB, that will give you the biggest chance of booting this board, an ISA multi-I/O controller card and an ISA VGA card to make this puppy boot in the first place. We're not even talking about what harddisks can be fit yet, prepare for a maximum of 540MB, maybe even smaller if we only have a table and no free-range entry in there.
Date-wise we are talking early 1990s indeed. 286s were never very popular because they were expensive and did not give much extra power compared to the original PC.
The 386 was blowing away the XT for not that much extra money compared to a 286...
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jeremfg
Pilgrim
Joined: 16 Aug 2010
Posts: 11
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| Posted: Sun Aug 22, 2010 8:34 am Post subject: |
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| Karlsweldt wrote: | Is the mobo now working or not? I note two possible problems. One is the battery, at the left edge by the processor. The end is bulging, and I note some blue stains on the mobo surface. That battery type is still available, but get it off (unsolder it) now, or the board will be useless. The second problem may be the master crystal (32.0 Mhz). Looks like there are two dents in its cover. That could damage its internal crystal oscillator.
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As you say, it's probably not working in it's current state...
I might eventually attempt to bring it back to life, but I don't really have the time for this now!
Of course, I would first attempt to repair/cleanup the battery issue, and take a good look at the master crystal and maybe replace it.
| evasive wrote: | | Anyway, as things are now I cannot make a definitive identification, you will need at least 2 exactly same 30pin SIP-modules (memory modules with pins on them) of 1MB, that will give you the biggest chance of booting this board |
Do you believe that the currently installed memory as gone bad?
As for the rest, I think I have everything I would require to try it out, eventually!
It was given to me in this current state, along many other old computer parts. A friend of my father was collecting old computer parts and then decided to pass on his collection. It took one and a half trip in a pick-up to transfer everything...
This motherboard is, so far, the only thing I can't identify!
The only other part that as given me a lot of trouble was a memory card for an old early IBM PS/1 model wich had proprietary memoy expansion card! |
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evasive
Mobo-fu Master
Joined: 06 May 2001
Posts: 36410
Location: Netherlands, Breda
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| Posted: Sun Aug 22, 2010 8:51 am Post subject: |
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quick test would be to put in known working ISA video card, connect monitor, connect power supply and power that on. if all goes well you get one beep and the bios message.
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