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> my dad wrote a disassembler for the 8080 in basic, and to simplify everything he rewrote all the mnemonics in a far simpler form than the official syntax from

• phkahler 5y ago
  >> If you or he still has his notes, would you be able to ZIP them up and upload them to archive.org? Not sure why, we were the only 2 people on earth to ever use that. To summarize, he used single letters for verbs and then single letters for register names: a, b,c, d,e, h,l for the 8-bit registers and x,y,z for the 16 bit pairs (b,c) (d,e) (h,l). It turns out you could always figure out some implied stuff. MAY was move a to y, but since A is 8 bits and Y is 16 this meant Y was an address, whereas MAD would be move A to D as an 8 bit register-to-register copy. This lead to all mnemonics being 3 characters or less. There could also be 8 or 16 bit immediate values. The disassembler used a 4 byte decode table - 3 characters and a size (0,1,2) of the immediate data. It was super clean. I'll post is somewhere some day. I still have my Interact computer in its original box waiting to find a nice museum somewhere. And lots of tapes including a bunch of little kid created basic programs. Hard copies of all the "Interaction" newsletters from the local users group too.
  • BBC-vs-neolibs 5y ago
    That as a blog post, optionally with your software downloadable, would be a nice addition to the history of the personal computer. (Just link your blog to archive.org then )