18 Apr
2000
18 Apr
'00
8:27 a.m.
On Mon, 17 Apr 2000, Richard Erlacher wrote:
Well, I've got one drive, an ST351, I think it is,
that responds to the
8-bit conditioning. It's a 1.25"-tall 3-1/2" drive, of 44 MB capacity.
That's not what I want for the "hard-card" on the S-100.
I have two of them. Never thought to try them as they are slow and very
old.
All your assertions about the relative folly of
expending effort/resources
to make the drive talk-8-bits wide has no real purpose except to bind it to
its historical roots. I'd bet that the logic in the 1003-WAH uses the
data-width bit to enable the IOCS16- signal and thereby lets the AT bus
control whether the transfer is 8 or 16 bits wide, since the AT bus is
required to do that.
Flog thyself if you care to. ;) Oh, the 1003WAH DOES NOT respond to
set_16bits. Before I ahd IDE drives to experiment with I tried it.
it still lost every other byte, just didn't generate the signal(IOCS16).
The 1003 was never useable in ISA-8 (xt bus).
What I did do instead was to use a WD1002WXA to make that interface
as it was already ISA-8 and easy to interface as a 8-bit controller.
Wrote an article for TCJ about it.
Allison