Curtis H. Wilbar Jr. wrote:
i.e. replacing the MFM chip in an AT&T 3B1 with a
daughter
board that then had a 50 pin IDC header on it for connecting to
a SCSI disk (or disks) ?
How hard would that problem be ?
The ST506 controller my system has is a so called "discret"
implementation of a ST506 controller including a Z80, CTC, sRAM, 74logic
and a PIO to commmunicate with the computer (datatransfer is routed
through the PIO to the Z8001 main CPU). If you are interested in a pic try
http://pics.pofo.de/gallery/v/P8000/P8000_boards/P8000_Winchester.jpg.html
So... replacing this would mean capturing the parallel communication
protocoll and reimplementing it for IDE/SCSI disks.
Building up a MFM -> IDE bridge would be more usefull for "all" ppl.
facing this problem. Or use some straight forward stuff like SD or
CF cards - who needs a 500GB disk drive in ST506 systems anyway...
But a universal bridge is not so easy.... right.
--
Oliver Lehmann
http://www.pofo.de/
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