Bought a cheap Desert Breaker for my collection which the seller declared as having no sound.
This game is running on system18 hardware. Since the sound was totally missing I first tested the z80 which was good and then I desoldered the SRAM which was
a Toshiba @IC79 , normally very unreliable in comparison to other makers and infact it was faulty.
It fixed the sound but playing I noticed that some sprites had missing lines
This problem could be either the custom chip 315-5361 ( sprite generator ) or the srams connected to it ( IC21 and 22)
Since all the address line were good, I proceeded to desolder and test the srams which were infact bad bad.
Game was fixed totally