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neauoire
6d445ccee1
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5 years ago | |
|---|---|---|
| examples | 5 years ago | |
| .clang-format | 5 years ago | |
| .gitignore | 5 years ago | |
| LICENSE | 5 years ago | |
| README.md | 5 years ago | |
| build.sh | 5 years ago | |
| uxn.c | 5 years ago | |
| uxnasm.c | 5 years ago | |
README.md
Uxn
A stack-based VM, written in ANSI C.
Build
cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
Assembly Syntax
:label, a named address+literal, a numeric value.pointer, pointer to a label
< conditionals >
0302 ADD
05 EQU
.there JMZ
:here
< when not equal >
ee
BRK
:there
< when is equal >
ff
BRK
Mission
- constants
- variables
- A Three-Way Decision Routine(http://www.6502.org/tutorials/compare_instructions.html)
- Carry flag?
- Loop
- Pointers/Literals
- Print word to stdout
- Draw pixel to screen
- Detect mouse click
- Jumps should be relative
- Catch overflow/underflow
- Audo-detect literals length.
- SDL Layer Emulator
- Build PPU
- Interrupts
16 Bit Missions
- 16 bits addressing
- jumping to subroutine should be relative
- Implement addressing
- Implement 16 bits operations
Refs
https://code.9front.org/hg/plan9front/file/a7f9946e238f/sys/src/games/nes/cpu.c http://www.w3group.de/stable_glossar.html http://www.emulator101.com/6502-addressing-modes.html http://forth.works/8f0c04f616b6c34496eb2141785b4454 https://justinmeiners.github.io/lc3-vm/