fixed up debug PC/SP addr

simu/src/main.rs

@@ -505,7 +505,7 @@ fn debug_context(com: &Computer) {
             com.regs[i + 8]
         );
     }
-    println!("SP={:08x}        PC={:08x}", com.sp, com.pc);
+    println!("SP={:08x}        PC={:08x}", com.sp * 4, com.pc * 4);
     println!("RAM at SP | Ram at PC:");
 
     let mut pc_lines = Vec::new();