24 Aug
2012
24 Aug
'12
3:43 p.m.
On 24 Aug 2012 at 14:21, Fred Cisin wrote:
There either needs to be a ROM, or key in enough code
to load from
disk. Do you consider the "system track[s]" that are NOT represented
in the DIRectory to be "FILE[s]"?
It didn't need to be much. I believe that Don Tarbell's disk
controller uses a 32-byte bipolar PROM to do get the first 128-byte
sector read from disk. That one-sector bootstrap loaded the BIOS,
then the BIOS loaded the DOS and CCP. My CCP loaded a driver for my
Diablo Hitype OEM model driven from a PT 3P+S board.
--Chuck