Editing POKEY (section)

===Audio Channel Frequency===

The AUDF* registers control the frequency or pitch of the corresponding sound channels. The AUDF* values also control the POKEY hardware timers useful for code that must run in precise intervals more frequent than the vertical blank.

Each AUDF* register is an 8-bit value providing a countdown timer or divisor for the pulses from the POKEY clock. So, smaller values permit more frequent output of pulses from POKEY, and larger values, less frequent. The values $0<sub>hex</sub>/0<sub>dec</sub> to $FF<sub>hex</sub>/255<sub>dec</sub> are incremented by POKEY to range from $1<sub>hex</sub>/1<sub>dec</sub> to $100<sub>hex</sub>/256<sub>dec</sub>. The actual audible sound pitch is dependent on the POKEY clock frequency and distortion values chosen. See [[POKEY#Audio Channel Control|Audio Channel Control]] and [[POKEY#AUDCTL $D208 Write|Audio Control]].

====AUDF1 $D200 Write====
Audio Channel 1 Frequency

====AUDF2 $D202 Write====
Audio Channel 2 Frequency

====AUDF3 $D204 Write====
Audio Channel 3 Frequency

====AUDF4 $D206 Write====
Audio Channel 4 Frequency

{| class="wikitable"
|-
! Bit 7 !! Bit 6 !! Bit 5 !! Bit 4 !! Bit 3 !! Bit 2 !! Bit 1 !! Bit 0
|-
| ? || ? || ? || ? || ? || ? || ? || ? 
|}