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Comment by vardump | Hacker News Reader

  // Zero page variables
  .const zp_x = $FB
  .const zp_y = $FE
  .const zp_dx = $101
  .const zp_dy = $104

AI extended zero page, I see… (zp_dx and zp_dy are in 6502 hardcoded stack range, not in zero page at all).

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I've noticed that LLMs have a hard time remembering all the constraints of 8-bit programming. Like sometimes it assumes that 6502 registers can have a value above 255, or in C it assumes that ints have 32/64 bits.

Also, if you have an array living in the zeropage, and you use Zeropage,X or Zeropage,Y instructions to try to access beyond address FF, it will wrap back to 00. Because it's a zeropage instruction that can't go outside the zeropage.

$101? $104? This looks familiar. If you try to train an LLM on series of lottery ticket numbers, say 1-50 and then ask for a set of numbers based on the training data LLMs sometimes will give you numbers like 110 or 101.

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