Z80Bus Sound Module
Z80Bus Soundmodule with YM2149.
SN76489 Update
This part is not working. TI idea about D0 is different ;)
For a working sound and joystick card you don't need the SN76489 (U2) and the 74HC688 (U5).
SN76489
J13 1/2 Selects onboard clock
J13 2/3 Selects CPU clock
With J12 you can select IO address of the SN76489
YM2149
J4 selects base IO address of the YM2149
J7 1/2 Selects CPU clock
J7 2/3 Selects Onboard clock
J7 Pin 2 can also be used for any external clock signal. Max for the YM2149 is 4 Mhz
J6 use if you want to divide incoming clock signal by 2
Joystick:
Joystick A connects to J5
Joystick B connects to J8
Wrong pin : If you have 2 separate fire buttons select them with J9 for joystick A and J10 for joystick B.
I use the dual db9 connectors with 10pin flat cable and slotcover
The YM2149 is split into Left and Right.
Z80Bus Sound Module
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