30 May
2000
30 May
'00
7:20 a.m.
On Tue, May 30, 2000 at 12:01:30PM -0700, Don Maslin wrote:
But that is/was not always true! There were a number
of 8" CP/M systems
that used bootable DD formats, and most all 5.25" CP/M systems were in a
bootable DSDD format.
I always figured the reason for the restriction was dumb boot PROMs, which
only know how to do programmed I/O to the FDC, and 8" DD comes in too fast
for typical 8-bit CPUs of the time to handle with PIO. If the boot PROM on
a particular system is smart enough to set up DMA, no need to require SD.
John Wilson
D Bit