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. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
Archive generated by hypermail 2.1.1.