some instructions have code and tests

beneater/src/bin/make_rom.rs

@@ -9,7 +9,7 @@ fn main() {
     let mut array: Box<[u8; SIZE_32KB]> = slice.try_into().expect("Unable to make rom in ram");
 
     array[0] = 0xa9; // LDA #$ab
-    array[1] = 0xab;
+    array[1] = 0xab; //      1010 1011
 
     // write the rom to disk
     fs::write("outputfile.bin", array.as_slice());