The Radica TV games consoles feature an ASIC version of the Sega Megadrive - that is, a real 68000 CPU core, Z80 CPU core, Sega VDP, and Memory are all throw onto one system-on-a-chip. This is great for power consumption and size, but unfortunately Radica, the manufacturer, skimped on the audio mixing circuitry. This results in distorted FM sound, and almost inaudible PSG (square waves) sound. Fortunately, this can be improved without adding any actual parts. I have this video I made; in the future, when I get another unit I will take a picture writeup on how things are wired. For now is this video.
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