Quoted from zacaj:
You're probably still losing one of the sound lines somewhere along the way.
Yes there is one command line missing, and I can tell you which one.
On the DD, the sound board use 5 bits commands (S1, S2, S4, S8 and S16).
The "Ball save" voice message has the command code (hexa) : $0E
The others voice messages "Shoot..., Captive..." are $11, $13, $14, $16 and $1E - and as you can notice, all have the 5th bit set to "1".
This means that the missing command line is S16.
On SYS80/80A the S1..S8 sound signals are driven by the MPU board (and the drivers board - replacing the Z13/7404 on it, was a good way).
But the additionnal S16 signal was not original planned, and Gottlieb use a lamp to drive this one. On the schematic you can see that the S16 wire does not follow the same way than S1..S8.
The missing signal can come from several places:
- The sound board itself. The S16 entry stage use an intermediate LM193 (U24). It can be toasted, but that's extremely rare.
- The connectors. The S16 goes through several connectors before arriving at the sound board: A3J2 from the driver board, A12P4/J4 in the lightbox, and A6J1 on the sound board.
- The driver board. The S16 "sound" is basically the L9 "lamp" ! Thus, check if the Q10 transistor (MPS-A13) is burned or not.