POKEY (POtentiometer and KEYboard Integrated Circuit) reference

POKEY register set:
|  | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
$D200 (R) | POT0 | Potentiometer 0 input
$D200 (W) | AUDF1 | Frequency
$D201 (R) | POT1 | Potentiometer 1 input
$D201 (W) | AUDC1 | Sound Distortion | On/Off | Volume Control
$D202 (R) | POT2 | Potentiometer 2 input
$D202 (W) | AUDF2 | Frequency
$D203 (R) | POT3 | Potentiometer 3 input
$D203 (W) | AUDC2 | Sound Distortion | On/Off | Volume Control
$D204 (R) | POT4 | Potentiometer 4 input
$D204 (W) | AUDF3 | Frequency
$D205 (R) | POT5 | Potentiometer 5 input
$D205 (W) | AUDC3 | Sound Distortion | On/Off | Volume Control
$D206 (R) | POT6 | Potentiometer 6 input
$D206 (W) | AUDF4 | Frequency
$D207 (R) | POT7 | Potentiometer 7 input
$D207 (W) | AUDC4 | Sound Distortion | On/Off | Volume Control
$D208 (R) | POTST | POT7 | POT6 | POT5 | POT4 | POT3 | POT2 | POT1 | POT0
$D208 (W) | AUDCTL | Distortion | C1 clock | C3 clock | C1+C2 | C3+C4 | C1 filter | C2 filter | base clock
$D209 (R) | KBCODE | CTRL | SHIFT | Key code
$D209 (W) | STIMER | unused
$D20A (R) | RANDOM | Random generator value
$D20A (W) | SKSTRES | unused
$D20B (W) | POTGO | unused
$D20D (R) | SERIN | Data
$D20D (W) | SEROUT | Data
$D20E (R) | IRQST | BREAK | KBCODE | SERIN | SEROUT | EOT | Timer 4 | Timer 2 | Timer 1
$D20E (W) | IRQEN | BREAK | KBCODE | SERIN | SEROUT | EOT | Timer 4 | Timer 2 | Timer 1
$D20F (R) | SKCTL | SPACE | Serial speed | two-tone | ADC spd | POKEY ctrl
$D20F (W) | SKSTAT | FrameE | SERIN E | KB E | SER E | SHIFT | KEY | Transfer | unused

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