diff --git a/src/main.c b/src/main.c
index 8e3620f..abb73aa 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,13 +2,20 @@
 #include "emu.h"
 #include "util.h"
 
-int main() {
+int main(int argc, char** argv) {
+
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s <ROM to emulate>\n", argv[0]);
+        return 1;
+    }
+
     Emulator* emu = initEmulator(0x00010FFF);
     if (!emu) {
         fprintf(stderr, "emu: error: failed to allocate memory for emulator\n");
         return 1;
     }
 
+    /*
     Instruction program[] = {
         {INST_MVI, {REG_A}, 0, true},
         {INST_MVI, {REG_B}, 123, true},
@@ -19,9 +26,19 @@ int main() {
 
     RomFile* f = readProgramFromFile("../add.o");
     memcpy(emu->mem + MEM_PROGRAM_START, f->instructions, sizeof(SerializedInst) * f->header.numInstructions);
+    memoryLoadProgram(emu->mem, program, sizeof(program)/sizeof(program[0]));
+    */
+
+    RomFile* rom = readProgramFromFile(argv[1]);
+    if (rom == NULL) {
+        fprintf(stderr, "Failed to read rom from %s\n", argv[1]);
+        return 1;
+    }
+
+    memcpy(emu->mem + MEM_PROGRAM_START, rom->instructions, sizeof(SerializedInst) * rom->header.numInstructions);
 
     startEmulator(emu);
     freeEmulator(emu);
 
     return 0;
-}
\ No newline at end of file
+}