Manual for Documation TM200 punched card reader

[Tony Aiuto]

Thanks! Seeing your wiring makes me realize what I was doing wrong with my
attempt.

On Sat, Sep 29, 2018 at 12:16 PM Jay Jaeger via cctalk <
cctalk at classiccmp.org> wrote:

> The information on my Documation card reader interface have now been
> uploaded, and is available at:
>
>
> https://drive.google.com/drive/folders/13KyRN4NuHIlTlBhoHiWZWmIfLwQbP5jn?usp=sharing
>
> 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.
> >
> > JRJ
> >
> >
> >
>