> Ed <firstname.lastname@example.org> wrote:
> > BTW "block 0" doesn't *have* to start at track 0 sector 0. By modifying
> > the disk r/w code you could, for example, have "block 0" begin at track 3.
> If memory serves, the user variable "off" was added to the requested block
> number. So on a per-task basis you could hae different views of the same
> underlying disk.
That rings a bell. Checking FORTH110.ASM the user variable was called
OFFSET which appears to be set by commands DR0 DR1.