Re: Patching the ProDOS Disk ][ driver?

[ferdimh@gmx.de]

I finally got it working now.
Because David Wilson told me that there's a ProDOS "RWTS" disassembly
on Apple Assembly line, I managed to fully understand the code and to
make a first running patch. But I couldn't access track 0  on the
second side (i.e. logical track 80). Today I figuered out this was a
fence-post error (the tracks are numbered 0-79 so track 80 and not 81
is the first track on the other side.) Now I'm making plenty of copies
of the disk with an (also self-written) 160-track disk copier and hope
at least one of them will survive whatever happens.
I noticed another interesting phenomenon: Writing to disk 1 is ok, but
writing to disk 2 is extremely slow. I have no clue what the cause
could be. This does not apply to all programs. ADT uses both drives at
high speed.
I really can't think why. Maybe you can...?

---
Ferdinand Meyer-Hermann