Mystery IC: Allen Bradley 314B102
ard at p850ug1.demon.co.uk
Wed Dec 16 11:59:40 CST 2015
> Tony, good advice but probably more work than I'm inclined to put in.
What I have suggested would take about 10 minutes tops. It has probably
taken me longer to type this message than it would take me to figure
> As you said there were many interfaces with different standards -
> different polarities and timing - and either way it's quite likely
Based on Brent's schematic and the date I wonder if it is similar
to the HP9866 interface. The connector is wrong, but the signals
(7 data lines, strobe, ready, paper out) are right. And it is a
machine that was around at the time. Possibly this was to get
letter quality output that didn't fade from some machine designed
to use that printer.
> this will never work with a standard modern parallel port without
> building some converter, after first finding out what has to be
> converted and designing it!
Probably just a matter of inverting some of the signal lines (i.e. '04s)
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