| Value | Meaning |
|---|---|
| M680X_REG_INVALID0 | |
| M680X_REG_A1 | < M6800/1/2/3/9, HD6301/9 |
| M680X_REG_B2 | < M6800/1/2/3/9, HD6301/9 |
| M680X_REG_E3 | < HD6309 |
| M680X_REG_F4 | < HD6309 |
| M680X_REG_05 | < HD6309 |
| M680X_REG_D6 | < M6801/3/9, HD6301/9 |
| M680X_REG_W7 | < HD6309 |
| M680X_REG_CC8 | < M6800/1/2/3/9, M6301/9 |
| M680X_REG_DP9 | < M6809/M6309 |
| M680X_REG_MD10 | < M6309 |
| M680X_REG_HX11 | < M6808 |
| M680X_REG_H12 | < M6808 |
| M680X_REG_X13 | < M6800/1/2/3/9, M6301/9 |
| M680X_REG_Y14 | < M6809/M6309 |
| M680X_REG_S15 | < M6809/M6309 |
| M680X_REG_U16 | < M6809/M6309 |
| M680X_REG_V17 | < M6309 |
| M680X_REG_Q18 | < M6309 |
| M680X_REG_PC19 | < M6800/1/2/3/9, M6301/9 |
| M680X_REG_TMP220 | < CPU12 |
| M680X_REG_TMP321 | < CPU12 |
| M680X_REG_ENDING22 | < <-- mark the end of the list of registers |
M680X registers and special registers