Adds a way to simulate the programs with spike, to compare PCs and debug

bench/programs_rust/fpga-lib/src/vga.rs

@@ -46,7 +46,7 @@ impl VGA
     {
         let c = if (c as u8 > b'~') || ((c as u8) < b' ')
         {
-            b'?' - b' '
+            b'/' - b' '
         }
         else
         {
@@ -79,21 +79,9 @@ impl VGA
     /// The text must have a length that can fit within a `u16`
     pub unsafe fn draw_string(x: u16, y: u16, str: &str, color: Color)
     {
-        //str.chars().enumerate().for_each(|(i, c)| unsafe {
-        //Self::draw_char(x + i as u16 * (FONT_WIDTH as u16), y, c, color)
-        //Self::draw_char(x + (i as u16) << 1, y, c, color)
-        //Self::draw_char(x, y, c, color)
-        //});
-
-        for i in 0..2
-        {
-            Self::draw_char(
-                x + (2 - i) as u16 * (FONT_WIDTH as u16),
-                y,
-                str.as_bytes()[i] as char,
-                color,
-            );
-        }
+        str.bytes().enumerate().for_each(|(i, c)| unsafe {
+            Self::draw_char(x + i as u16 * (FONT_WIDTH as u16), y, c as char, color)
+        });
     }
 
     unsafe fn font_plate_index(x: u16, y: u16) -> bool