Re: petSD project page

Jim Brain <brain@jbrain.com> writes:

> Scanning both busses might be an issue, but maybe not insurmountable.

The easiest way would be to wait for an ATN signal from either bus at
startup, then servicing only that bus until the AVR is reset. This
scheme might switch to the wrong port if there are other devices
connected on both ports and not all of them are powered on.

A bit less easy to implement is to allow switching whenever the
currently-serviced bus is idle and there are no open files. The last
condition avoids situations where someone might shoot themselves in the
foot, e.g. by accidentally accessing files on the same secondary number
from both computers at the same time.

I know what is probably the hardest way, but I won't mention it because
there is a chance that someone misremembers it and later asks why it
wasn't implemented. =)

-ik

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