Chr$
Experienced Member
Posting in case anyone recognises this board. It's a generic XT clone with 7 x 8bit ISA and 5 EPROM sockets. The BIOS contains the strings "(C) COMPUTER TURBO version 2.0 1985 International Business System" and "(C) PC/XT TURBO 8 MHz SYSTEM". On the solder side it has "PMC' and separately "OEM/PC REV B1".
I've googled a lot, as you do! This chap here has a 99% identical board:
Restoring the old PC-XT clone mainboard - MCbx (oldcomputer.info)
I can't find a way to contact him though and it would also be nice to have full manual info on the 15+ jumpers that relate to the EPROM configuration as I'm not as clever as the above website owner. The other 4 'proms on my board contain IBM Personal Computer Basic, v C1.10. (incidentally...that's obviously the cassette basic, so how on earth do you use that on an XT clone, which has no way of hearing or playing sound?).
I am fairly sure that the little block of 8 switches is the same configuration as this similar example:
TURBO - V4 (arvutimuuseum.ee)
The board condition is very nice, as you can see. It turned on twice (without a monitor connected) before the PSU exploded. I need to take care of that first as I don't have another to hand that isn't in something else. Speaker doesn't work, but apart from that I think it made all the right noises. All voltages were present. In the pic there is a missing 74x logic chip as I found it was faulty and am waiting on a replacement.
The generic serial ports/extra RAM!/RTC card is another story as it had a NiCd battery on it that made a right mess, as usual. Fortunately it seems to have been stored upside down and it only damaged the card it was on.
I've googled a lot, as you do! This chap here has a 99% identical board:
Restoring the old PC-XT clone mainboard - MCbx (oldcomputer.info)
I can't find a way to contact him though and it would also be nice to have full manual info on the 15+ jumpers that relate to the EPROM configuration as I'm not as clever as the above website owner. The other 4 'proms on my board contain IBM Personal Computer Basic, v C1.10. (incidentally...that's obviously the cassette basic, so how on earth do you use that on an XT clone, which has no way of hearing or playing sound?).
I am fairly sure that the little block of 8 switches is the same configuration as this similar example:
TURBO - V4 (arvutimuuseum.ee)
The board condition is very nice, as you can see. It turned on twice (without a monitor connected) before the PSU exploded. I need to take care of that first as I don't have another to hand that isn't in something else. Speaker doesn't work, but apart from that I think it made all the right noises. All voltages were present. In the pic there is a missing 74x logic chip as I found it was faulty and am waiting on a replacement.
The generic serial ports/extra RAM!/RTC card is another story as it had a NiCd battery on it that made a right mess, as usual. Fortunately it seems to have been stored upside down and it only damaged the card it was on.