Apple floppy adaptor. I'm stuck!

[Tristan Mumford <xtristan.xmumford@xgmail.xcom>]

G'day.

As you may or may not know I've been working on a little device to allow PC
3-1/2" floppy drives to be used on a disk ][.

It can now do the following:

* de/Select and spin up/down the drive.
* Detect the write-protect state of an inserted floppy.
* Move the head around.

What it can't seem to do is read and write. The basic question I want to ask
is whether the apple2 has an active high or low for read and write pulses.
I believe it's active high, but I'm starting to doubt myself a little.

By the way. The slow stepping gives the PC floppy that satisfying "GRONK"
sound of the apple drives.

Another possibility I guess is that I have some kind of weird error in the
head movement causing it to move to the wrong tracks.

Is there some kind of low level format that I can do on an apple floppy. I
tried the ProDOS format, but it looks like it only does track 0, somewhere
in the middle, and track35? I just got that from watching the head
movements.

I'm hoping I can get this issue sorted, because it's nearly done! I hope I
can get it working right, because I actually decided to use a calculator to
figure out final storage capacity *Gasp!*. A 2HD disk should hold 640kb. In
it's current form a normal 2HD disk appears as one big single-sided 160
track disk.

Anyway, I appreciate any help that I can get. Especially because my problems
could be solved in seconds with a CRO, or a knowledgable person.

Tristan.
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