First post, by nextse7en
Howdy gang.
I've tried just about everything to get this machine running again, and I just can't get there.
The board is unusual. a 486 dx50 (not dx2) sits on a daughterboard with a cache controller and a ton of cache.
Board is marked with a Phoenix Bios copyright, though I don't know the version.
When powering up, I get the following beep code |-|-|||.
ISA diagnostic card displays "02", which, depending on the BIOS version either is a CMOS error or "Verify Real Mode"
Things I've tried.
Disabling onboard IO
Disabling onboard VGA
Replacing Dallas 1287+ with a new one.
Modifying new 1287 with a battery pack.
Replacing 1287+ with a glitch works replacement
Parity RAM
Not Parity RAM
Verifying capacitors
Replacing power supply
No matter what, I get the same beep code. The ONLY way I can get anything else is if I put more that 16mb in one of the memory banks without first setting the jumper for "16/32". This is largely useless info, except to say that the machine is at least capable of detecting how much RAM in in it.
Any help would be really appreciated.
Thanks