Z80 REPL

6 comments

• flyinghamster 29 minutes ago
  The one thing I lamented about the Apple II Plus (vs. the original with Integer BASIC) was that to make room for autostart, they had to rip out the mini-assembler in the Monitor ROM. That was the closest thing I ever saw to an assembly-language REPL before this. At least they were able to keep the disassembler.
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  • boomlinde 10 minutes ago
    It's common in the C64 world to use freezer cartridges that allow you to interrupt normal operation and invoke a monitor program. These typically include rudimentary assemblers and disassemblers as well. Fun and useful for patching and reverse engineering!
• networked 1 hour ago
  Cool idea! The REPL needs to handle whitespace after an instruction with no operands:

    > ld c,20h
    0E 20   (7 cycles)
    > ld c,20h [<-- trailing space here]
    0E 20   (7 cycles)
    > nop
    00      (4 cycles)
    > nop [<-- trailing space here]
    unknown instruction: nop
  

  I also wish I could select from the completion list with Tab without typing more of the instruction, fish-style. I.e., you press Tab to go through completion 1, completion 2, ..., completion N, completion 1 again with Enter to confirm your pick.
• jottinger 35 minutes ago
  The source code for this is apparently 8 years old: https://github.com/abagames/z80-repl

  With that said, I love the idea.

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  • wkjagt 18 minutes ago
    That makes me love it even more
• torutofu 16 minutes ago
  the fun part is how fast you can get back into Z80 muscle memory once the repl is giving you immediate feedback
• j4cobgarby 1 hour ago
  Really nice! Would be fun if there were a few examples that could be loaded into memory
• Marbleferry815 51 minutes ago
  [dead]