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The AY-3-8910 has 16 registers: | The AY-3-8910 has 16 registers: | ||
{| | {| class="wikitable" style="text-align:center;" | ||
!Register!!Purpose!!Width!!Notes | |||
|- | |- | ||
|0||Channel A fine pitch|| | |0||Channel A fine pitch||8 bits | ||
|- | |- | ||
|1||Channel A coarse pitch|| | |1||Channel A coarse pitch||4 bits | ||
|- | |- | ||
|2||Channel B fine pitch|| | |2||Channel B fine pitch||8 bits | ||
|- | |- | ||
|3||Channel B coarse pitch|| | |3||Channel B coarse pitch||4 bits | ||
|- | |- | ||
|4||Channel C fine pitch|| | |4||Channel C fine pitch||8 bits | ||
|- | |- | ||
|5||Channel C coarse pitch|| | |5||Channel C coarse pitch||4 bits | ||
|- | |- | ||
|6||Noise pitch|| | |6||Noise pitch||5 bits | ||
|- | |- | ||
|7||Mixer|| | |7||Mixer||8 bits | ||
|- | |- | ||
|8||Channel A volume|| | |8||Channel A volume||4 bits | ||
|- | |- | ||
|9||Channel B volume|| | |9||Channel B volume||4 bits | ||
|- | |- | ||
|10||Channel C volume|| | |10||Channel C volume||4 bits | ||
|- | |- | ||
|11||Envelope fine duration|| | |11||Envelope fine duration||8 bits | ||
|- | |- | ||
|12||Envelope coarse duration|| | |12||Envelope coarse duration||8 bits | ||
|- | |- | ||
|13||Envelope shape|| | |13||Envelope shape||4 bits | ||
|- | |- | ||
|14||I/O port A|| | |14||I/O port A||8 bits | ||
|- | |- | ||
|15||I/O port B|| | |15||I/O port B||8' bits||(not used by AY-3-8912) | ||
|} | |} | ||