>
> I've been trying to figure out whether
> I could make a 2600 emulator for my
> 64 - mind you, this isn't a stock 64.
> It's got a board called a SuperCPU,
> a 20Mhz 65816 that emulates a 6502
A 6502/816 doing single-step by placing instructions into a temporary
holding area then executing them can run at about 7% of real-time. If
doing address computation, masking of the 2600's high order address
bits, etc you'd be lucky to get to 2% of realtime (times 20 for your
fast '816, for a total of 40% of the speed of a real 2600.)
I wrote a 6502-based package for doing fast code "emulation" for the
purpose of debugging games while working at Electronic Arts. It was
too slow to bother with for any but the *worst, intractable* bugs.
> I've heard that there is C source
> available for a 2600 emulator -
> I haven't located it yet.
And that was presuming hand-tuned assembly language. Go to C, not the
best language for the '816 (stack addressing modes are *SLOW*) and you're
looking at a worthlessly slow solution.
The slowest 68K based machine to be *theoretically* good enough to run
2600 emulation would be around a 25 MHz '030, based on my experience on
Stop The Madness (an Apple II emulator with hand-tuned 680x0 assembly
everywhere, rewritten several times and tweaked *to death.*)
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