Sound Hardware

There are two capacitors that can be switched onto each audio channel to ground. The MSB bit set to one selects a 0.22uF and the LSB bit set selects a 0.047uF cap. Most effects just switch out the caps (writing 00), but the explosion effects switch in one or the other (never both).

V1 1000xxxxAAxxxxxx
V2 1000xxAAxxxxxxxx
V3 1000AAxxxxxxxxxx
V4 1000xxxxxxxxxxAA
V5 1000xxxxxxxxAAxx
V6 1000xxxxxxAAxxxx

4000	AY0_DATA
5000	AY0_ADDR
6000	AY1_DATA
7000	AY1_ADDR