First post, by Intel486dx33
I have a new old stock 486 motherboard.
That only supports 5v cpu’s
I have installed a 486dx-33 cpu
16mb FPM ram.
128kb -20ns cache.
I also tried a 486dx-66 and a 486dx-50
With no success .
I have a PC diagnostics reader attached.
See the error code. “FF - - “
It will not post or display anything. No video. No beep error codes.
That’s all I get.
What can be wrong with this motherboard ?