Re: Fast serial interrogation timing question

Jim Brain <brain@jbrain.com> writes:

> Does anyone have any thoughts on why the "can you do fast serial"
> interrogation happens even before ATN falls on the C128/C128D/DCR?

The part that happens before ATN isn't an interrogation, it's just an
announcement that the computer is fast serial-capable. The drive is
still addressed using slow serial for all ATN "command bytes" and when
it determines that it is addressed and should act as a listener, it
responds with a single fast serial byte to signal to the computer that
it can use fast serial. If the drive is addressed as a talker, it just
sends data via fast instead of slow serial.

-ik

       Message was sent through the cbm-hackers mailing list