| | 38 | I wired the diodes on a piece of protoboard. |
| | 39 | |
| | 40 | This wiring scheme require your buttons to have two free wires. If this is not the case, for example if your control panel has a single ground connected to all buttons and only one wire for each of them, you can still get it working with some TTL logic. |
| | 41 | |
| | 42 | A 74LS244 buffer can be used as follow : |
| | 43 | * plug VCC to +5V and GND to GND |
| | 44 | * plug your buttons to A (input) pins |
| | 45 | * plug a wire in the 7..12 range to the 1G and 2G pins |
| | 46 | * plug wires from the 1..6 range to Y (output) pinsmatching the A you used. |
| | 47 | |
| | 48 | This does not conflict with the diode system above and if needed, you can mix both on the same card. For example, we use diodes for the buttons, but a buffer for the coin mechanism. |
| | 49 | |
