First post, by Vegge
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So I have this motherboard that I really would like to get working. This picture is from when I bought it. I have replaced the missing 7F244N.
The motherboard has Opti localbus and I would really want to try my NOS et4000ax for that port.
This is how far I've gotten with it;
I have tried different sets of ram in both bank 0, bank 1 and in both.
I have tried 64k, 128k and no cache.
Checked traces with magnifying glass and when in doubt with dmm.
CPU gets warm, it goes veeeery slowly through the post (looking at postcard) and after 1m30s halts at code 00 13 and then starts beeping. 6 long beeps but low pitch and since thats not a known code I suspect it's really 6 short but slowed down a lot. I tested this by removing the RAM and sure enough after 1min30s I get 3 low pitch long beeps. That 6 beep code seems to be "8042 - gate A20 failure".
Different kbc makes no difference regarding error code but with one of the AMI ones I tried the error beeping comes right away instead of after 1m30s.
Replacing the 33mhz oscillator didn't do anything either (its socketed anyway so easy to try).
I don't really know where to go after this. I have had problems with wierd beeping on a S7 board before and that one hade problem with voltage to the cpu but this seems to be fine (reads 5v).So I really don't know. Any thoughts and ideas would be appreciated.