Feb 242018
Bought this classic as not tested but luckily it was working except the missile sound was completely missing.
Looking at the schematics I found this
In the game there are only two missile sounds.
Shot A is your ship missile sound, while Shot B is the one from some enemies
IC37 is an LM3900 op amp which is very unreliable and infact after changing it , the missile sound was restored
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