Xerox 820-II diskette formats
snhirsch at gmail.com
Sun May 3 13:42:02 CDT 2009
On Sun, 3 May 2009, Chuck Guzis wrote:
> The 820-II 8" samples in my library show 77*1*26*256 and 77*2*26*256
That's fairly conservative, but works out to almost a 1MB for the DSDD
diskettes. Most systems I'm familiar with formatted at 32 x 256 in DD
> I believe that alternative ROMS were also offered by third parties.
I've found a couple of examples out there.
> I believe that there might be source code for the BIOS ROM for the
> 820-II wandering around also. There certainly is for the Ferguson
> Big Board, which is a close relative.
Would be interested in the "official" sources if anyone can point me to
More information about the cctalk