durgadas311
Veteran Member
I've got the schematic mostly done. There's a few non-obvious connections to trace out, if you want it more complete. Referring to the schematic and layout:
1) There are some control connections between the PIOs and the 50-pin connector (P3) that I can't make an educated guess about. PIO pins 16, 17, 18, 21 (both units) are connected in some order to the P3 pins 11, 12, 23, 24, 35, 36, 47, 48. If you can trace those out, we can have a complete picture of that connector. Note, pin 1 on the connector is marked by that raised triangle/arrow on the top of the connector housing.
2) P1 (first DIP14 socket of the pair) pin 13 is raising questions. In the photos it looks to me as though it goes to A0, but that doesn't make sense since all other signals are buffered there and BA0 is already on that connector. I'm not sure where it goes, perhaps to one of the logic gates near the CPU.
Thanks
1) There are some control connections between the PIOs and the 50-pin connector (P3) that I can't make an educated guess about. PIO pins 16, 17, 18, 21 (both units) are connected in some order to the P3 pins 11, 12, 23, 24, 35, 36, 47, 48. If you can trace those out, we can have a complete picture of that connector. Note, pin 1 on the connector is marked by that raised triangle/arrow on the top of the connector housing.
2) P1 (first DIP14 socket of the pair) pin 13 is raising questions. In the photos it looks to me as though it goes to A0, but that doesn't make sense since all other signals are buffered there and BA0 is already on that connector. I'm not sure where it goes, perhaps to one of the logic gates near the CPU.
Thanks