Help identify 286 mobo.

[Arabski]

This is tough one... Some time ago I bought this thing, and I simply cannot find anything relevant online. Here's couple of hi-res pictures:



There are some links in TH99 (alias statson) that are similar to this, but I don't think any of them depict the board in question:

http://www.artofhacking.com/th99/m/U-Z/30418.htm
http://www.artofhacking.com/th99/m/U-Z/30770.htm
http://www.artofhacking.com/th99/m/U-Z/32420.htm
http://www.artofhacking.com/th99/m/A-B/32291.htm

I know it's a long shot, but does anybody recognize this thing?

 

[Druid6900]

I can't really see enough of it to see if it has any unique identifying features. A lot of time, the name is usually between the ISA slots or silk-screened onto the board in some obscure location that you can only see with a magnifying glass and tilting the board at the right angle.

 

[Chuck(G)]

Looks like a generic Taiwanese 286-12 Headland board--there were a jillion variations of this, since there wasn't much to a motherboard other than the chipset. Few actually used any Intel parts at all--the CPUs tended to be AMD or Harris.

 

[Arabski]

OK, after some poking around I was able to figure out front panel connections:

JP8  -> o o - Turbo Switch
JP9  -> o o - Reset
JP10 -> + o - Turbo LED

JP13 -> x x x o o - Keylock
JP14 -> o x x o   - Speaker

I don't know where Power LED is - three unused pins on JP13 are not it.

 

[Chuck(G)]

Betcha it is JP13. Try pins 1 and 5 (shared with the keyswitch). Reverse polarity if no lightee.

 

[Arabski]

Betcha it is JP13. Try pins 1 and 5 (shared with the keyswitch). Reverse polarity if no lightee.

You mean two wires from one pin? That would be strange... But I think I'll pas on looking for PowerLED - front panel that I use fortunately has PowerLED integrated with frequency display so it's not a must.

I got another question though. Is it possible that the board won't accept config with 3M of RAM? All the links in first post show 2, 2.5 and then 4M. I have 4 256K SIPPs that I thought could be used but bummer! Board sees 2M max. When I populated all 4 banks with DIP-20 chips inserting or removoing SIPPs makes no difference . When only 3 banks of DIPs were populated board was seeing SIPPs... Or is it a matter of configuration with J11 & J12?

 

[Chuck(G)]

Seemingly, when you use the Bank 4 SIPP positions, you can't use all of the DIP positions. My guess is that some of the signal lines are shared between the DIP and SIPP sockets.

Probably a chipset function.

 

[Arabski]

When only 3 banks of DIPs were populated

I stand corrected - 2 banks of DIPs and 4 slots of SIPPs.

Seemingly, when you use the Bank 4 SIPP positions, you can't use all of the DIP positions. My guess is that some of the signal lines are shared between the DIP and SIPP sockets.

Then I think I'll call it a day. I'll just leave it at 2xDIP and 4xSIPP. I'll stick remaining DIPs intro VGA cards and be done with it. Thanks for replies