modem7
10k Member
As suggested by Per, did you measure the +5V ? The turning fan in the PSU does not indicate that all PSU output voltages are present and correct.
In post #34 of thread http://www.vintage-computer.com/vcforum/showthread.php?7065, Per points to an adapter for a 2764.
At http://members.dodo.com.au/~slappanel555/bios.htm are BIOS ROM images for the 5150.
An adapter for a 27256 (or 27C256) is at http://members.dodo.com.au/~slappanel555/5150_u33.htmWhere can I find the pinout of this roms? Is it possible to build an adapter and replace the original ROM with a 27Cxx EPROM?
In post #34 of thread http://www.vintage-computer.com/vcforum/showthread.php?7065, Per points to an adapter for a 2764.
At http://members.dodo.com.au/~slappanel555/bios.htm are BIOS ROM images for the 5150.
No.Do the 5150 BIOS send messages to the 80h port? Will an ISA POST debug card receive them?
Correct.On keyboard fail, only a 301 is displayed? no beeps?
If the POST gets that far. Right at the end, just before the POST attempts to boot from a drive (i.e. start 'bootstrap').But I assume that at least the POST OK beep is produced...