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Output Ports
| Port Number (hex) | Equate | Function | Notes |
|---|---|---|---|
| 0 | COL0R | Color Register 0 (Right) | |
| 1 | COL1R | Color Register 1 | |
| 2 | COL2R | Color Register 2 | |
| 3 | COL3R | Color Register 3 | |
| 4 | COL0L | Color Register 0 (Left) | |
| 5 | COL1L | Color Register 1 | |
| 6 | COL2L | Color Register 2 | |
| 7 | COL3L | Color Register 3 | |
| 8 | CONCM | Low/High Resolution | Always Low on Astrocade |
| 9 | HORCB | Horizontal Color Boundary, BG Color | HCB (bits 0–6), BG (bits 6–7) |
| A | VERBL | Vertical Blank Register | # of vertical lines x 2 to be used for screen update) |
| B | COLBX | Color Block Transfer | |
| C | MAGIC | Magic Register | |
| D | INFBK | Interrupt Feedback | 8 bits of vector to be returned by interrupting device upon receipt of INTAK from Z80) |
| E | INMOD | Interrupt Enable and Mode | Always 8 in cartridges |
| F | INLIN | Interrupt Line | |
| 10 | TONMO | Tone Master Oscillator | |
| 11 | TONEA | Tone A Frequency | |
| 12 | TONEB | Tone B Frequency | |
| 13 | TONEC | Tone C Frequency | |
| 14 | VIBRA | Vibrato/Tremolo | |
| 15 | VOLAB | Tone C Volume, Noise Modulation Control | |
| 16 | VOLC | Tone A Volume, Tone B Volume | |
| 17 | VOLN | Noise Volume | |
| 18 | SNDBX | Sound Block Transfer | |
| 19 | XPAND | Expander Pixel Definition | |
[NM:106, 143, source listing 5]
