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SlowROM: Difference between revisions
From SnesLab
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'''SlowROM''' is 2.68 Mhz. It is not as fast as [[FastROM]]. SlowROM is a property of the ROM chip itself and not the board it is soldered onto.<sup>[2]</sup> [[DMA]] always happens at SlowROM speed. When the [[5A22]] is operating at slowROM speed, there are 8 [[master clock]] cycles per CPU [[machine cycle]]. | '''SlowROM''' is 2.68 Mhz and its ROM access speed is 200ns. It is not as fast as [[FastROM]]. SlowROM is a property of the ROM chip itself and not the board it is soldered onto.<sup>[2]</sup> [[DMA]] always happens at SlowROM speed. When the [[5A22]] is operating at slowROM speed, there are 8 [[master clock]] cycles per CPU [[machine cycle]]. | ||
[[File:master_clock_divider_speeds.png]] | [[File:master_clock_divider_speeds.png]] | ||
Latest revision as of 17:07, 19 August 2024
SlowROM is 2.68 Mhz and its ROM access speed is 200ns. It is not as fast as FastROM. SlowROM is a property of the ROM chip itself and not the board it is soldered onto.[2] DMA always happens at SlowROM speed. When the 5A22 is operating at slowROM speed, there are 8 master clock cycles per CPU machine cycle.
See Also
References
- Near, https://forums.nesdev.org/viewtopic.php?t=9585
- Bregalad, lbid.