Daniel Caetano wrote:
[garbaged sound on 7MHz]
> Only FM (YM2413) is affected by "garbage sound" on 7Mhz, because it cannot
> cope with the "flood" of information sent to it by the program... if you
> use the interruption to control the timing to send FM data, the problem
> will disapear (just like happens on MicroCabin games, Valis 2, etc).
Not necessarily true. If I make the PSG generate a monotonic sound
(e.g by doing a couple of 'SOUND x,y' instructions in BASIC) and then switch
between 3.57 and 7.14MHz (so no information flowing between PSG and z80 at
that time!) the sound gets distorted too. Same holds for other music extensions
(SCC, MSX-Music, MSX-Audio)...
Eric
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