Manual for Documation TM200 punched card reader
cube1 at charter.net
Sat Sep 29 11:16:40 CDT 2018
The information on my Documation card reader interface have now been
uploaded, and is available at:
On 9/24/2018 5:58 PM, Jay Jaeger via cctalk wrote:
> FYI, I have a design for a RS-232 interface to the Documation M series
> interface, based on a PIC 16F877. The design is in turn based on one
> that does not use a PIC, that Al Kossow shared with me some time back -
> and is designed to work with the same software on the PC side (at least
> if I recall correctly - I did this back in 2013). [I seem to recall
> that when I was testing it, I just used a terminal emulator of some
> sort, so PC side software would be easy.]
> The board design is in KiCAD. The "firmware" for the PIC is in C,
> developed using MPLABX (freely available).
> So, if anyone wants the materials, say so, and I will share a link, and
> scan in my interface connector pinouts, etc., and put up a folder on my
> Google Drive.
> I also still have *ONE* *UNPOPULATED* board (approx. 4.25" x 2.5") that
> I would be willing to part with for $10 US + S&H. As I recall, there is
> one missing pull-up resistor that is wrong on the schematic (and thus
> missing on the board, too), from pin 1 of the PIC to VCC, and is easy to
> deal with, and that the LED labels on the silk screen are flipped around
> on the board vs. the schematic [which can be dealt with easily in
> software, so that the LEDs match the silk screen.] The design includes
> an in-circuit programming header.
> Unfortunately, the pinouts I used for the 40 pin connector on the PC
> board to the card reader are NOT the same as what the Computer History
> Museum has, and it makes wiring the cable a bit of a pain, because the
> signal and signal return lines are not next to each other on the
> connector, but should be so using a twisted pair cable.
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