Hi!
Does anyone have the *electrical* specifications of the IEEE488 bus?
The only piece of information I have is that it uses "multi-drop lines",
which I assume to be equal to an open-collector bus. However, I'd like
to know how much current I have to sink to make things work.
I'm trying to get a working IEEE-488 implementation on a 8051, and I'd
like to know if I can directly tie its I/O pins to the IEEE-488 bus. The
8051 can be configured to use open-collector on its I/O pins, but there
are some culprits. For instance, 3 out of the 4 ports have internal
pull-up resistors, and I'd like to know if that has a serious impact
on the bus. Secondly, these I/O pins can officially sink only 15 mA,
allthough 20mA is not a problem.
(the whole intention is to re-implement Andre's IEEE-to-serial converter,
using off-the-shelf components. Andre used several chips which aren't
really *that* easy to obtain, like RIOTs)
--
Martijn van Buul - Pino@dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
Kees J. Bot: The sum of CPU power and user brain power is a constant.
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