[snip]
>We have no indication that there is any
>difference between serial ports on any non-PowerPC models, except those
>with only one serial port (in which case we don't really know what
>happens).
What do you mean by "difference"?  Apple has used a number of ASICs to
handle serial port functions.  Depending on which ASIC is involved, GPi on
pin 7 may not be supported, which probably means that there are other
differences as well.  Also, some non-PPC macs have DMA serial ports (Q
660AV & 840AV), some have I/O processors (Q 9x0, 700, IIfx), and some have
a ninth pin that provides +5V off of the ADB, just like the GeoPort (Q 605,
LC575(?), the LC 520 was *supposed* to, others?).

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