fixed colors on the PPU

src/main.rs

@@ -79,6 +79,7 @@ fn run_dbg(path: &str) {
     let mut cpu = Cpu::new();
     cpu.reset(&mut bus);
     let mut dumper = dump::Dumper::new();
+    let mut renderer = PpmRenderer::new();          // <-- add this
     let frames: u32 = 360;
 
     for f in 0..frames {
@@ -87,8 +88,9 @@ fn run_dbg(path: &str) {
             bus.tick_ppu(cycles as u64);
             if bus.take_nmi() { cpu.set_nmi(); }
         }
+        renderer.present(bus.framebuffer(), 256, 240);   // <-- and this
         dumper.snapshot(f, &bus, &cpu);
         bus.begin_frame();
     }
-    println!("wrote debug_out/ (state.txt + pctrace.txt), {frames} frames");
+    println!("wrote debug_out/ + renders/, {frames} frames");
 }