More Alto remarks

Mark Kahrs mark.kahrs at
Wed Jan 24 12:38:55 CST 2018

I had forgotten about OrBit.  According to this very nice document:!1.pdf

... the Orbit hardware was 4 cards in the Alto II backplane.  As I recall,
the SLOT interface was only 1 card; it was connected to a slower speed
printer.  The only modification to the Alto: wire wrapping the task signals
(don't ask me how I know...)

And yes, I agree, only the high bandwidth I/O used tasks.  The use of tasks
and "time sharing" the Alto processor innards is one of the Alto's real

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