ruud.baltissen_at_abp.nl
Date: 2007-03-29 07:51:51
Hallo Bryan,
> What do you mean by other I/O ICs in the drive since it looks
> like NFRD is output only.
NRFD is generated by a 6522 and goes to the bus through a 75161. And then there is that is what I call the "ATN trap" formed by an EXOR gate (UG2, gate 2) and a 7406 OC invertor. (code unreadable). Have a look at the schematic of the 2031 on zimmers.net, page-30r.html, bottom at the middle. All these four parts can be blamed.
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/ / |_/ Groetjes, Ruud
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