7 Jan
2005
7 Jan
'05
2:19 a.m.
On Thursday 06 January 2005 18:44, Jim Leonard wrote:
Patrick Finnegan wrote:
I believe the AHA-1542 (and B, C, and CF) were all 16-bit boards,
whereas I'm trying to increase the I/O of an 8-bit IBM 5150...
Well, I've had good luck with using 16-bit cards (mostly VGA) in 8-bit
machines (mostly 5150s and 5160s). You could try it out; it might
actually work just fine.
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
There
was one 8-bit ISA hard disk controller card for the IBM
PC or XT that would do a 1:1 interleave, from Patterson Labs.
Don't know how they did it, but they worked. They were always
unusual, probably impossible to find today, but Google it.
RLL was way too fast for the PC/XT bus at 1:1 interleave, but
there was at least one 8-bit controller from Seagate that worked
with only one 30 MB IDE drive. I don't remember the numbers.
They would work with a higher interleave, 3 or 4 sounds about
right.
Why not just get a SCSI controller? Surely you can get an AHA-1542
or something to work on an 8-bit bus, and it'll probably have
better performance (and easier to find disks) than any IDE or
MFM/RLL (ST-506) controller for the era.