On the main circuit board, J8 is an unpopulated 5×2 connector near the CPU blob. From flipping bits, I've determined that the pinout is as below. NOTE: This pinout has not been verified independently (we welcome verification).
Pin | Signal |
---|---|
J8-1 | +3VDC Supply |
J8-2 | PC22 |
J8-3 | PC29 |
J8-4 | PC27 |
J8-5 | PC28 |
J8-6 | PC21 |
J8-7 | PC18 |
J8-8 | PC20 |
J8-9 | PC19 |
J8-10 | Ground |
J7 is an unpopulated 4×2 connector. It contains the 4 ADC inputs. (Full scale appears to be 1.8V.)
Pin | Signal |
---|---|
J7-1 | ADC channel 1 |
J7-2 | ADC channel 0 |
J7-3 | ADC channel 2 |
J7-4 | Ground |
J7-5 | ADC channel 3 |
J7-6 | Ground |
J7-7 | +3VDC Supply |
J7-8 | Ground |
On the main circuit board, the serial programming connector is visible when the slide-off back cover is removed to replace batteries. It appears to provide the following signals. *NOTE: This pinout has not been verified independently (we welcome verification).**
Pad | Signal |
---|---|
J31 | +3VDC Supply |
J32 | Reset |
J33 | Serial out (logic level) |
J34 | Ground |
J35 | Serial in (logic level) |
J36 | Erase? |