Re: Patching the ProDOS Disk ][ driver?

[David Wilson <mcs6502@gmail.com>]

On Nov 24, 1:29 pm, David Wilson <mcs6...@gmail.com> wrote:
> The problem with patching it to support 80 or 160 tracks is fitting
> the code into the space available - it is optimized for testing $01xx
> blocks.

Good news. I checked my copy of the Beneath Apple ProDOS supplement
and it turns out that the Disk II driver occupies $D000..$D6FF and the
last 22 bytes ($D6EA..$D6FF) {directly following the command/block
number check} are unused. If this is not enough space, I suspect that
converting the driver from 6502 to 65C02 code might free up more
space.