Re: IO interface.

"Arne Chr. Jorgensen" wrote:

> I just came to think of something, what about the IEEE 488 bus. I
> remember that you had this bus on plotters, measuring devices, and
> such. (HP-IB) This one could address about 30 attached devices. It
> should be possible to find some ISA cards, and some logic chips,
> so you could make your own IO device. It has a 8bit data bus, and
> should be fast enough.

It is SLOW, WAY too slow, for motion control. With a CPU at each
end, you are lucky to get a couple hundred commands a second across
the GPIB. With physical hardware at each end, it does a little better,
but still too slow for what you are talking about. When sending long
blocks of data, it works pretty well, but when sending a small bit of
data to several devices, the protocol gets in the way.

Jon