Re: 1541 -> 2031

From: Rhialto (
Date: 2000-09-11 12:15:42

On Mon 11 Sep 2000 at 10:46:42 +0300, Marko Mäkelä wrote:
> Maybe I should try to measure the voltages with the cable disconnected,
> both from the drive and from the PET.  What are the proper levels for
> logical '1' and '0' on the IEEE-488 bus?

0 is 0V, 1 is 5V. To make matters interesting, many of the signal names
have negative names and there are also inverters in the  output path, so
if you see ROM code store a 0 in some output port, you have to think a
few times to realise what exactly it means ;-)

> 	Marko
___ Olaf 'Rhialto' Seibert - rhialto@polder   -- Ah only did well at school
\X/      -- tae git intae an O level class tae git away fae Begbie.
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