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URCL ASM
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Convert URCL to ASM

Verified by Adam B.· reviewed by FE Editorial ·updated Jun 21, 2026
QUICK ANSWER
Is it possible to convert URCL to ASM?
Yes - URCL converts to ASM.

Run a URCL compiler such as Haku8866's reference compiler with a config file describing your target ISA; it rewrites the .urcl instructions into that architecture's assembly and writes them to an output file you can save as .asm. Because URCL is generic, the quality of the result depends entirely on how complete and correct your ISA config is.

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert URCL to ASM?

URCL is a universal intermediate language deliberately kept close to RISC assembly so it can be mapped onto almost any .asm target. Developers compile .urcl to real assembly when they want to run redstone-computer or homebrew-CPU code on a specific instruction set rather than an emulator.

How to convert URCL to ASM

URCL reference compiler (Haku8866/URCL) OPEN-SOURCE

Run py URCL.py <myISA> program.urcl output.txt where <myISA> is your Python ISA config (based on Template.py/ExampleISA.py); rename or save the emitted assembly output as .asm.

URCL.NET OPEN-SOURCE

Use the URCL.NET toolchain to load a .urcl program and emit target assembly; it applies core-instruction lowering before writing the ISA-specific output.

About these formats

.URCL URCL Assembly Source Code File

A .urcl file is a plain-text source file written in URCL (Universal Reduced Computer Language), a simple RISC-style assembly language used mostly by the Minecraft redstone computer…

Open .URCL details →
.ASM Assembly Language Source Code File

An ASM file is assembly language source code - a plain-text file of low-level CPU instructions. Open it in any text editor to read or edit it. To run the code, assemble it with NASM, MASM,…

Open .ASM details →

Quality & what to watch

  • You must supply a correct ISA config; without it the compiler can't know which target assembly to produce.
  • Complex URCL instructions get lowered to core instructions, so the resulting .asm can be longer and less optimal than hand-written code.
  • There is no single 'the' assembly output - each target ISA produces different .asm, so results are not interchangeable.

Frequently asked questions

Is there a one-click urcl-to-asm converter?
No, you run a compiler with an ISA config file; the target assembly depends on that config.
What does the config file define?
It maps the core URCL instructions to your CPU's instructions and sets specs like BITS and register count.
Why is my output assembly longer than expected?
The compiler replaces unsupported complex instructions with sequences of core instructions, which adds lines.
Can I test the result before targeting real hardware?
Yes, the reference compiler ships an emulator you can run on the intermediate output to verify behavior.