@@ -17,6 +17,7 @@ clang-format -i uxn.c

 clang-format -i emulator.c

 rm -f ./bin/emulator

 cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator

+cc -std=c89 -DNO_SDL -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator-nosdl

 # cc uxn.c emulator.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -L/usr/local/lib -lSDL2 -o bin/emulator

 # run

@@ -238,6 +238,7 @@ quit(void)

 int

 init(void)

 {

+#ifndef NO_SDL

 	if(SDL_Init(SDL_INIT_VIDEO) < 0)

 		return error("Init", SDL_GetError());

 	gWindow = SDL_CreateWindow("Uxn", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH * ZOOM, HEIGHT * ZOOM, SDL_WINDOW_SHOWN);

@@ -254,6 +255,7 @@ init(void)

 	clear(pixels);

 	SDL_StartTextInput();

 	SDL_ShowCursor(SDL_DISABLE);

+#endif

 	screen.bounds.x1 = PAD * 8;

 	screen.bounds.x2 = WIDTH - PAD * 8 - 1;

 	screen.bounds.y1 = PAD * 8;

@@ -429,12 +431,17 @@ ppnil(Uint8 *m, Uint16 ptr, Uint8 b0, Uint8 b1)

 int

 start(Uxn *u)

 {

+#ifndef NO_SDL

 	int ticknext = 0;

+#endif

 	evaluxn(u, u->vreset);

 	loadtheme(u->ram.dat + PAGE_DEVICE + 0x00f8);

+#ifndef NO_SDL

 	if(screen.reqdraw)

 		redraw(pixels, u);

+#endif

 	while(1) {

+#ifndef NO_SDL

 		int tick = SDL_GetTicks();

 		SDL_Event event;

 		if(tick < ticknext)

@@ -455,9 +462,12 @@ start(Uxn *u)

 				break;

 			}

 		}

+#endif

 		evaluxn(u, u->vframe);

+#ifndef NO_SDL

 		if(screen.reqdraw)

 			redraw(pixels, u);

+#endif

 	}

 }

new file mode 100755

@@ -0,0 +1,13 @@

+#!/bin/bash

+set -e

+EMULATOR=./bin/emulator

+if [ "${1}" = '--no-sdl' ]; then

+    EMULATOR=./bin/emulator-nosdl

+    shift

+fi

+if [ -z "${1}" ]; then

+    printf 'usage: %s [--no-sdl] USM_FILE\n' "${0}" >&2

+    exit 2

+fi

+./bin/assembler "${1}" bin/boot.rom

+"${EMULATOR}" bin/boot.rom