This board features both stereo sound and speech capabilities. Two Z80 CPUs on the board do the work, running independantly of the game's CPU board. Sampled speech clips are recorded in ROMs on the board played via a TMS5220 speech chip. There are adjustment pots for each circuit (stereo left, stereo right, speech) to adjust their relative volume, and a final mix and amplification stage that feeds the sound to the two backbox mounted speakers and to the single speaker mounted in the bottom of the cabinet. There is a volume pot mounted near the coin door to adjust the final volume. There are two TDA1510 amplifiers used on this board. This board was used in Dakar, Motor Show, and Mac Attack.
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| Photo by Peter Hall |
This board features both stereo sound and speech capabilities. Two Z80 CPUs on the board do the work, running independantly of the game's CPU board. The TMS5220 is no longer present, and this board features more ROM space for a larger set of sound effects, played via the DAC. This board was used only on World Cup '90.
The TDA1510 amplifier IC used on these sound boards is not a common part in the US, though it appears to be more common in Europe. Be careful not to short the speaker terminals, or otherwise overload the amplifier outputs, as it will fail instantly. These are expensive, around $15-20 per chip, the only source I know of for them is an electronics supplier in London, England.
| Note: I have not yet investigated the communication between the CPU and Sound boards. I suspect that it is similar to, if not identical to, the 2nd generation Zaccaria communication protocol. But that is speculation at this time. |