Re: Calling all DOS-heads

Nate Lawson <nate@root.org> writes:

> He uploaded another copy of this one that is readable.

Thanks, much better.

> In the without_ack case, the DATA line never goes low so the ZF tries
> a few more times of toggling ATN before giving up and reporting
> "device not present".

If I understand the original message correctly the "without_ack" case is
a drive with a hardware modification - basically a (simulated) defect in
the hardware ATN acknowledge circuit.

> I did send Jim a special firmware that will wait forever for DATA to
> be acked. But perhaps it's never ACKed in this case since the ROM code
> expects the circuit to handle it?

Why do you expect correct operation when the hardware is broken?

-ik

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