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* 		5 years ago
.clang-format * 5 years ago
.gitignore Basic parts 5 years ago
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README.md * 5 years ago
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program.usm * 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

: 	starting a definition
& 	obtaining pointers
( 	stack comments
` 	inlining bytecodes
' 	strings
# 	numbers
$ 	characters
~   vector
[ 12 34 ] real values
< 12 34 > relative values
( 12 34 ) deadzone

;add-two JSR

BRK

:add-two
	[ 2 ] ADD RTS

Design

CPU

  • Build stack with pointer
  • Print stack
  • Build memory

PPU

Assembly

Addressing

  • label, a named offset[TODO]
  • literal, a numeric value
  • pointer, pointer to an address[TODO]

Assembler

Emulator

  • SDL Layer