Steal the pokey for extra atari pcb parts.
Later,
dabone
EDIT:
C012294B-01 'POKEY' ('POT and KEY')
* 4 independant, 8 bit channels, which can be combined to
o one 16 bit/ two 8 bit channels or
o two 16 bit channels
(although overall output is always mono)
* each channel can be controlled in frequency and volume, and can output tones/ noise created by a noise control circuit (including low- and high-pass filtering)
* POKEY had also been used in the earlier 8 bit ATARIs (ATARI 400, 800, 1200XL), and in some arcade machines
Also used to control input to centipede pcbs. and others.