N64 has a chance. I wouldn't hold your breath on a perfectly working one for a while. The p64 team was very damn busy but almost got 64 emulation working 99% well on PCs.
The PSP's MIPs chips are the successor to the 64's so they should be able to run 64 games pretty well if the code is done well.
64 is the highest I believe the PSP can achieve, anything else seems very unlikely (75%).
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