Definitions:
- Per channel: resistor from channel output to ground (kOhm)
- Join res: resistors joining from ch. output to a net common to all channels (kOhm)
- Lump res: resistor from the common net to ground (kOhm)
- ac: ac coupling capacitor, in uF
| Game | Chip Model | Per ch. | Join R. | Lump | ac | Remarks |
|---|---|---|---|---|---|---|
| Ghosts'n Goblins | YM2203 | 1 | 4.7 | 2 | 10 | |
| Robocop | YM2203 | 10 | 56 | 1 | 10 | |
| Combat School | YM2203 | 3.2 | 1 | 4.7 | one ac cap for all channels | |
| Bubble Bobble | YM2203 | shorted | 1 | 10 | single cap for all chips | |
| The New Zealand Story | YM2203 | shorted | 1 | 0.1 | Applies to other boards of the same series (JTKIWI core) | |
| 1942 | AY-3-8910 | 10 | 220 | 2 | 10 | |
| Karate Champ | AY-3-8910 | 1 | 1 | 1 | ch. C of chip 1A | |
| Karate Champ | AY-3-8910 | shorted | 1 | 1 | ch. B/C of chip 1A, all of chip 3A (5 ch.) | |
| Roc'n Rope | AY-3-8910 | 6.1 | 1 | all ch. connected to a virtual ground |
Bubble Bobble is misconnected. Due to YM2203's buffered output, shorting all channels will make the higher output voltage dominate at any time.