27 May
2008
27 May
'08
11:05 p.m.
Andrew Lynch wrote:
Hi,
I am trying to revive an original IBM XT motherboard using an AWARD
POSTcard.
Unfortunately, I do not have the manual for the POSTcard.
Does anyone have one or can help with the switch settings? The XT uses IO
port 60h for the POST code whereas the AT uses port 80h.
I know the POSTcard works since it gives proper codes on AT class machines
(486 and newer)
Thanks in advance for any help!
Andrew Lynch
Assuming your Award POST card is an early one (BAR in the lower left
corner) then SW1 sets the address.
It decodes the lower 10 bits of the address bus as follows:
SW1 position 1 2 3 4 5 6 7 8 9 10
Address A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
ON= 0, OFF = 1
Default is 80h
ON ON OFF ON ON ON ON ON ON ON
For 60h
ON ON ON OFF OFF ON ON ON ON ON
I have the users manual for the card, but my scanner is currently not
working for some reason. If you need more info,
I can look it up for you.
Bob