How performant is this - are we able to achieve similar speeds as an actual 68k Mac on embedded hardware?

vardump 10 hours ago | parent | next [-]

At 8 MHz, a 68k can execute at most 2M instructions per second. So the answer is going to be yes, if this manages to execute one 68k instruction per ~200 cycles.

I think executing an instruction is going to be closer to 20-50 cycles than 200, so it should be much faster than a real 68k CPU.

I think performance is likely to be in the ballpark of a 68040 @20 MHz, but that's just a guess. This would leave 20 cycles for each emulated instruction. With JIT you could reach 200 MHz+ comparable speeds.

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rasz 9 hours ago | parent [-]

Everything is coming from PSRAM including frame buffer (at 15 fps) so performance is going to be abysmal.

	▲	vardump 8 hours ago \| parent [-]
		You should be able to cache hot code and data in the SRAM. Although it'd significantly increase complexity.

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iamflimflam1 11 hours ago | parent | prev [-]

The P4 is pretty high spec with a 400MHz dual-core RISC-V

	▲	cardanome 7 hours ago \| parent [-]
		Especially as there is a decent working BasiliskII port for the PlayStation Portable with its 333MHz single-core MIPS CPU. So this should be much easier.