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@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 > > > > > > >
