MAME SNES emulation is very demanding by default and activating the overclock only makes it worse. Only MAME has an option to change the main CPU frequency, which requires you to enable cheats. 7.6 MHz: Color palette errors sprites fail to render.6.6 MHz: Color palette errors sprites fail to render.4.1 MHz: Small amounts of sprite breakup occasionally very little slowdown.In testing overclocks on the original hardware, the following issues occur (speeds listed represent the maximum effective clock rate): In the case of ROM access, it also depends on whether bit 0 of CPU register 420D is set to 0 (SlowROM, 8) or 1 (FastROM, 6). 21.477/6 = 3.58) and memory access can take 6, 8, or 12, depending on the area of RAM is accessed. This is because any CPU operation takes 6 master cycles (i.e. Though uncommon, this is required for some games, a notable example being Contra Force.įor an NTSC SNES, the master clock rate is approximate ~21.477 MHz, but the CPU's effective clock rates are ~3.58 MHz, ~2.68 MHz, or ~1.79 MHz. If you happen to experience graphical glitching or crashes with a PPU overclock, try the VBlank Scanlines ("After NMI" in Mesen) option instead. 240 Post-render Scanlines (Referred to as "Before NMI" in Mesen) should be more than enough for most games. Both are found under Options > Emulation > Overclocking.įor PPU Overclocking, the number of additional scanlines is user-defined. Mesen as of 0.2.2 includes the same feature, as well as CPU overclocking. PuNES as of 0.101 includes the same feature. This method doesn't cause audio distortion. įCEUX as of 2.2.3 includes an overclocking option which works by adding additional scanlines to the PPU loop. Overclocking is possible on real hardware, but doing so also speeds up the audio unless you're using a special hardware mod like the HiDefNES which does allow for overclocking without changing the audio pitch. 6.1 List of games that can take advantage of overclockingīy default MAME allows you to change the clock speed of the systems it emulates (including consoles) to anything between 50% to 250% of the original clock speed, the only requirement is that you enable cheats for that game/system.
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