On Jun 1, 2007, at 6:33 AM, David Boyes wrote:
No, I mean the Model 40, and it's not a DB-9 port. It's square, with
a 3x3 pin matrix. It's probably just the internal connection from
the keyboard to the display and line converter.
You are correct. Pin 1 is supposed to be a +18V DC source, and pin
9 is
frame ground. The other 7 are scanner inputs to the driver circuit on
the main board.
Unless you have one of the very rare upper/lower-case models, the
inputs
are multiplexed SIXBIT in a very odd style that makes sense when you
consider the mechanical origin in the ASR33, but seems insane
otherwise.
You could probably get it working, but there'd be a lot of DTL
involved.
This looked to me like an ideal job for a PIC microcontroller,
actually. It seems like, although it would take a lot of discrete
logic, it would be a fairly easy thing to build with a clock and a
state table.
Adam
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