The ym2610 io test tests the following things
- If the ym2610 busy bit is already set, test fails.
- Disable timer/interrupts by writing 0x30 to register 0x27 then re-read the register data back and verify its 0x30. If not, test fails.
- Using test patterns 0x00, 0x55, 0xaa, and 0xff. Write them to register 0x00, then re-read the register data back and verify it matches the pattern. If not, test fails.
If any of these fail it will result in the following error.
| Hex | Number | Beep Code | Credit Leds | Error Text |
|---|---|---|---|---|
| 0x10 | 16 | 010000 | x0 / 16 | YM2610 I/O ERROR |