If the PCB doesn't have the audio pot hooked up to it, you'll need to add one yourself.
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How to add sound to your Frogger board by Gregg Woodcock.
If you do not hook up an external potentiometer, you will have no sound
from your Frogger PCB.
There is a small .100" MTA connector on the top board that has six pins.
The 6-pin connector "6P" in the lower-left corner of the upper, smallest
PCB is where the volume control goes. Reading from left to right on the
top of the PCB and the potentiometer (with the pins of the pot pointing
down), starting at 1 the pinout is:
pin 2 of 6P goes to pin 1 of the potentiometer (black wire)
pin 4 of 6P goes to the pin 2 (wiper) of the potentiometer (white wire)
pin 6 of 6P goes to the pin 3 of the potentiometer (red wire)
In one of the connection diagrams, they show a two-conductor shielded
wire. The shield is used for the pin 6 to potentiometer connection (pin
6 is ground, so this gives you some shielding). In another diagram,
they list the wire colors and none of them are indicated as shileded.
In another diagram, the potentiometer value is lised as "200K" but this
is WRONG! In yet *another* diagram, the correct potentiometer value is
listed as 200 Ohms.
What I do is mount a regular knob-type potentiomter (i.e. not the mini
PCB-mount type) on that gigantic heat sink connected to IC2 (NOTE: be
*very* careful that you do not drill "past" the metal and into one of
the chips below. If you are at all doubtful that you can pull this off,
remove the heat sink from the board to drill it).
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I believe this document assumes you have the Konami pinout version of the boardset.
