7 Nov
2007
7 Nov
'07
1:29 p.m.
Grant Stockly wrote:
So, WHY do all these old cards use 8T97 type drivers
to force the wait
line? I guess its only the MITS display board and 1k memory board that
drive the wait line regardless of if they are addressed or not. Whats
wrong with these guys using open collector parts with a pullup???
Tell that to the designers of the PC XT on IRQ's.They wanted to save $$$
and charge more $$$.
I'll report on how robust it is later on.
I've had several false starts
with this setup...
Grant
.