Uxntal assembler, written in Tal
Print missing stack error
Minor optimization


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You can also use your local clone with git send-email.


Drifblim is a Uxntal assembler, written in that same language.

The assembler is written in about 400 lines, it's designed to help bootstrap the Uxn ecosystem and to demonstrate the concept of a personal one-page computer concept. The goal is for Driflim's source code to be released as a print-friendly document, along with its assembled hexadecimal data and the napkin definition of the Uxn virtual machine.


  • drifblim.tal Self-hosted assembler.
  • unicycle.tal Console REPL.
  • bicycle.tal Graphical REPL.


This assembler is written in the language it is assembling, creating a chicken-and-egg problem. You have two choices, download a pre-assembled drifblim.rom(1300 bytes), or use uxnasm.c.

# from uxnasm
uxnasm src/drifblim.tal bin/drifblim.rom
# from drifblim.rom
uxncli bin/drifblim.rom src/drifblim.tal

If do not wish to assemble it yourself, you can download drifblim.rom.


  • LIST Displays a list of all available routines.
  • PRINT/PRINT2 Prints the value at the top of the stack.
  • MOD/MOD2 Pushes the modulo of X and Y, onto the stack.
  • ABS/ABS2 Pushes the absolute value of X, onto the stack.
  • RAND/RAND2 Pushes a random value between 0 and X, onto the stack.
  • QUIT Turns off the system.


  • mouse2 Inject mouse position into input.

Drifblim is strong enough to lift Pokémon or people but has no control over its flight. This causes it to drift with the wind and end up anywhere.