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You can get a 20MHz Z80 that will overclock up to 33MHz or so. A Z8S180 runs at 33MHz and includes timers, uarts, dma, and an MMU. I don't know how much you cou
by Gracana 7y ago
You can get a 20MHz Z80 that will overclock up to 33MHz or so. A Z8S180 runs at 33MHz and includes timers, uarts, dma, and an MMU. I don't know how much you could overclock one of them, but it's already pretty fast for an 8-bit chip.
Zilog also makes the ez80, which is like the Z180 but runs at 50MHz and has a 3 stage pipeline, and it has a 24-bit mode.
On the 6502 side, there's the 65C816S which is the fully-static CMOS version of the 65816, which is a 6502-compatible CPU with a 16 bit mode and 24-bit addressing. The Apple IIgs had one, but its clock speed was limited to 2.8MHz so as not to compete with the Macintosh. Today you could build a machine with a 14MHz 65C816S and fast SRAM, and have a pretty beastly 6502-compatible machine.