Re: 1541 -> 2031

From: Marko Mäkelä (
Date: 2000-09-11 09:46:42

On Mon, 11 Sep 2000, Frank Kontros wrote:

> What line drivers you used? CMOS, HCT(MOS)?

The schematic is in the January 1986 issue of the 64'er magazine.  The
line drivers were some 74xx chips; I think 74160 and 74161 (I don't
remember if they are LS or what), and I don't have the documents here.
Nicolas, do you remember this?

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?


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