I'm pretty sure I just saw a paper copy of the TM200 manual which is different from the M200. I'll have to dig around to try to find it again. On 9/22/18 7:52 AM, Kyle Owen via cctalk wrote:

On Sat, Sep 22, 2018 at 10:34 AM, Guy Dunphy via cctalk <cctalk at classiccmp.org> wrote: I have an M200 and I just had to look up in the docs (on bitsavers) that my unit requires a Hubbel 7484 for the power cable. Yours is different but it's likely to be some sort of Hubbel product. Hmm... I probably need to look into mine for similar things. Fortunately, my M200 came with a factory add-on board that's an RS-232 interface to the upstream host. An old co-worker buddy of mine gave me a box of his punchcards when he was in school in 1970. He's really on me to read them. I don't want to put his in first and have roller goo or something else ruin them so I have a bit of exploration to do. I'll be interested to hear how your saga unfolds because I'm expecting all of that and more on mine. -ethan

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 On 9/22/2018 10:53 PM, Ethan Dicks via cctech wrote:

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: