| Value | Meaning |
|---|---|
| invalid0 | |
| a | M6800/1/2/3/9, HD6301/9 |
| b | M6800/1/2/3/9, HD6301/9 |
| e | HD6309 |
| f | HD6309 |
| _0 | HD6309 |
| d | M6801/3/9, HD6301/9 |
| w | HD6309 |
| cc | M6800/1/2/3/9, M6301/9 |
| dp | M6809/M6309 |
| md | M6309 |
| hx | M6808 |
| h | M6808 |
| x | M6800/1/2/3/9, M6301/9 |
| y | M6809/M6309 |
| s | M6809/M6309 |
| u | M6809/M6309 |
| v | M6309 |
| q | M6309 |
| pc | M6800/1/2/3/9, M6301/9 |
| tmp2 | CPU12 |
| tmp3 | CPU12 |
M680X registers and special registers