1 Nov
2001
1 Nov
'01
10:35 a.m.
Cameron Kaiser wrote:
All 8-bit Commodore disk drives have CPUs, period,
IEEE or no. Some older
drives have two, one for "IP" to accept commands over the Commodore serial
bus and one to act as FDC. 1541s and later drives have "schizophrenic" CPUs
that alternately switch between IP and FDC modes on interrupts. MFM-capable
drives like 157xs and 1581s have a special FDC (usually WD-1770 or 1772-type
controllers).
I was at one time hoping to pick up a Commodore Disk cheap for floppy
drive for a computer I am building but never did because I did not have
the docs about the interface. 5 1/4 Single Density Single Sided drives
did not help either.Is the C64 drives the only external drives built
other than the Color Computer drives by Radio Shack?
Ben Franchuk.
BTW It is too bad OS/9 was a closed source OS.
--
Standard Disclaimer : 97% speculation 2% bad grammar 1% facts.
"Pre-historic Cpu's" http://www.jetnet.ab.ca/users/bfranchuk
Now with schematics.