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List of games supporting/patched for 7Mhz?

By olliraa

Champion (325)

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17-09-2020, 09:57

Could not find anywhere. I was wondering if I'd finally install a "turbo" for my NMS8235 (already modded for MSX2+). I know there are e.g. Gradius etc. patches by Victor, but would someone have a "complete" list. By supporting/patched I mean corrected PSG pitch and/or other symptoms related to non-standard clock.

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By meits

Scribe (6577)

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17-09-2020, 10:44

Aren't those patches fixing the turbo mode of the Panasonic MSX2+ machines? They have a stable pitch. 7MHz machines switch back on every I/O access which makes the pitch highly instable. I've not seen it in action, but it could be that the pitch is recalculated on every I/O access.

Fixing the pitch for external audio chips has been done for long. In the 90s cartridges were fixed with their own oscillator. Those chips are rather impossible to find lately. Because of that I chose to put a constant 3.58MHz clock on my cartridge slots and that works a treat. Just the PSG left.

By olliraa

Champion (325)

olliraa さんの画像

17-09-2020, 11:14

Meits wrote:

Aren't those patches fixing the turbo mode of the Panasonic MSX2+ machines? They have a stable pitch. 7MHz machines switch back on every I/O access which makes the pitch highly instable. I've not seen it in action, but it could be that the pitch is recalculated on every I/O access.

Fixing the pitch for external audio chips has been done for long. In the 90s cartridges were fixed with their own oscillator. Those chips are rather impossible to find lately. Because of that I chose to put a constant 3.58MHz clock on my cartridge slots and that works a treat. Just the PSG left.

Oh, if that's the case... Any links to schematics on how to add the oscillator to the cartridge slots? Smile