GPIB state machine info WTD

[Philip Pemberton]

In message <m1EECCS-000IyXC at p850ug1>
          ard at p850ug1.demon.co.uk (Tony Duell) wrote:

> Actaully, a PERQ centronics interface, but I can't see any good reason 
> why it wouldn't work with a PET (although it doesn't do any kind of code 
> conversion.

That's the one! A couple of 16V8s and a 20V8, right?

> No, you misunderstood me. There is no CPU involved in this serial 
> adapter. The EPROM is the logic for the GPIB handashake. It's the GPIB 
> timing that's way out. It works with a PET as the other side of the link 
> because the PET does all the handshaking in software, so it's pretty 
> forgiving about timing problems. But this seiral adapter will _not_ with, 
> say, a 9914 as the other device on the bus..

Ah. Probably better to use that as an example of how not to design a GPIB
interface, I guess.

Thanks.
-- 
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