5 Feb
2007
5 Feb
'07
2:39 p.m.
some pcs didnt have dma. Tandy 1000...IBM
Peanut...Sanyo MBC-5xx too IIRC...
Correct (well, it was option in the Tandy 1000, it was included on the
RAM expansion board).
I would also claim the Sanyo MBC-5xx was not a PC-compatible. Yes it ran
MS-DOS, but it wouldn't boot an IBM PC disk AFAIK.
Anyway, the fact that there are machines out there, even machines that
will boot an IBM PC disk, that don't have DMA doesn't invalidate my
comment that the IBM PC, XT and AT, and (most?) compattbles do use DNA to
transfer data from the floppy controller and can carry on processing
while a flippy disk operation is taking place.
-tony