Project-Nested: An NES Emulator Running on the SNES

Re:Project-Nested: An NES Emulator Running on the SNES by a1369209993 on Sunday July 11, 2021 @06:34PM (#27805008)

> there's no special benefit you get from having code in the zero page anyways afaik.

You save one cycle off each instruction that modifies another instruction, which can important for inner loops. See eg http://www.linusakesson.net/programming/gcr-decoding/index.p..., although that's a disk-induced realtime requirement, rather than hblank/beam-induced.

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Re:Project-Nested: An NES Emulator Running on the SNES by stormbrew on Monday July 12, 2021 @12:02AM (#27806917)

ah ok yeah that makes sense. If you're directly modifying the instructions then yeah there's a big benefit to the zero page. I think I misread the GP post and missed the self-modifying context somehow.

Thanks for clarifying :)

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Re:Project-Nested: An NES Emulator Running on the SNES by bonzini on Monday July 12, 2021 @02:55AM (#27807798)

For an example, search for 0073 or CHRGET at https://www.pagetable.com/c64ref/c64disasm/

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