Corrected the schematics.
Not sure if there are more mistakes...

Does it makes better sense?

- New toggle
- 4013 Toggle.png (10.86 KiB) Viewed 10227 times
Could this work without the 2nd flip-flop?
It's a little difficult to trace, since the board has some damage and a little oxidation...
The schematics would make things clear if I could get it.
I only have a simple multmeter that measures resistense, AC and DC volts and some amperage.
I'm trying to find a proper socket to use on the IC.
As soon as I put it back I'll check these voltages.
Thanks for the tips
I also tought it was the controller, but I swapped them and got the same results.
Maybe it's some damaged trace or connector?
I tried to draw the joystick 2's output circuit.
Here is player 2's 9 pin connector as from under the board, with the 10k resistors omitted:
Code: Select all
IC-8, 12<------| |-----> IC-8, 6
| |
IC-8, 10 <--O O O O--> CPU, 38
GND <-----O O O O O----> VCC
IC-8, 15 <---| | |-------> IC-8, 2
\/
CPU 39
Code: Select all
IC-8 74HC368
.--\/--.
CPU Pin 35 |01 16| VCC
Controller Pin 4 |02 15| Controller Pin 2
CPU Pin 28 |03 14| CPU Pin 30
? |04 13| ?
CPU Pin 27 |05 12| Controller Pin 7
Controller Pin 8 |06 11| CPU Pin 24
CPU Pin 26 |07 10| Controller Pin 6
GND |08 09| CPU Pin 25
`------´
Maybe if I redo the traces to CPU pins 35, 28, 30 and 39 fix the issue.
I had a huge problem with some VRAM traces that when touched made continuity...
Maybe this can be the same case?