TC5080P:
Browning Baron, Cobra 132XLR/135XLR, Tram D62: <L7, L3, R134-AMC, R130-ALC>
TC5080P (Toshiba)
Substitute: ECG1207 (Sylvania)
P0 1| |16 Vdd <--(Good place to get your +5v)
P1 2| |15
P2 3| |14
P3 4| |13
P4 5| | 12
P5 6| | 11
P6 7| | 10 DO*
P7 8| | 9 Vss <--(Ground)
*Divider Output to TC5081
A simple binary Programmable Divider, used along with the TC5081 Phase Comparator and the TC5082 Reference Oscillator and Divider.
Pins P0-P7 control the frequency. Pn is binary, meaning P0 has value of 1 and P7 has value of 128. Changing the voltage (usually +5v or Ground) of the pins will change the output frequency (or "Channel") accordingly by driving the VCO up or down accordingly.
Example: You're on Channel 19 (27.185 MHz) and you read the pin outputs and notice that Pin 6 (n=32) is grounded. If you were to add +5v to that pin, the radio would be "driven up" 320 KHz to channel 27.505. Voila, extra channels!
There's more to it than this, but this should get you on your way.