> There was 1 7-bit DAC in the YM2612 and it had no DMA capability. That means you had > to devote either the Z80 or the 68000 to feeding it samples at a precise rate. And > the samples were uncompressed in the cartridge most of the time. So the upshot is > that increasing the sample quality increased both CPU load and cartridge space > requirements very quickly.
especially if you wanted to try and get multiple channels out of it, which by the sounds of it is what Capcom were trying to do.