Do you like to overclock your NES? Run this ROM and see how far you're pushing the CPU. And if you've figured out how to change the clock while the power is on, be even more amazed.
This is part of the NES POST project.
EDIT: It has come to my attention that the way I'm figuring cycles per line has some systematic error due to FCEUX sucking at timing when the 9 sprites bit is activated. I have updated the ROM.
Overclock demo
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Overclock demo
- Attachments
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- oc-r1a.zip
- With corrected sprite 0 trigger horizontal position
- (24.41 KiB) Downloaded 2249 times
- l_oliveira
- Posts: 409
- Joined: Wed Jul 13, 2011 6:51 am
- Location: Brasilia, Brazil
Re: Overclock demo
Machine has a Brazilian M-PAL clone discrete PPU (same timing as NTSC but outputs color information in PAL standard), UM6548, clocked at 21.453666Mhz(3.575611Mhzx6).
@29.498928Mhz:

Dendy-esque UMC CPU

Legit RP2A03E
Using the legit RP2A03E CPU with the NTSC clock:

With M-PAL clock:

@29.498928Mhz:

Dendy-esque UMC CPU

Legit RP2A03E
Using the legit RP2A03E CPU with the NTSC clock:

With M-PAL clock:
