On Sat, 10 May 2008 11:32:03 -0500, "Jorge R. Frank"
wrote:

James Of Tucson wrote:

At one time, the GPCs were based on a Motorola 68000, but a special
one that was designed for the space program.
That one ran OS-9. It was actually the second generation GPC, in
84.

No. The GPCs have always been from the IBM AP-101 family. They started
out as AP-101B and were upgraded to AP-101S starting in 1991. The S has
more memory and has the IOP integrated into the CPU, while the B had
separate CPUs and IOPs.

IIRC, 68000s did turn up in the updated Main Engine Controllers circa
1990. I had an Amiga at the time and was impressed that some part of
the Shuttle was also now using the 68000.

Brian