feat: implement JSR instruction HEAD main

I decided to pull in byteorder to ease up some of the work here.
Additionally, the test program has been modified, and I've added a todo
for the LDR Absolute instruction.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/main.rs b/src/main.rs
index 7f6df89..2fcee18 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -28,15 +28,21 @@ fn main() {
 
 	// little program
 	if let Some(opcode) = memory.data.get_mut(0xFFFC) {
-		*opcode = 0xA5;
+		*opcode = 0x20;
 	}
 	if let Some(opcode) = memory.data.get_mut(0xFFFD) {
 		*opcode = 0x42;
 	}
-	if let Some(opcode) = memory.data.get_mut(0x0042) {
+	if let Some(opcode) = memory.data.get_mut(0xFFFE) {
+		*opcode = 0x42;
+	}
+	if let Some(opcode) = memory.data.get_mut(0x4242) {
+		*opcode = 0xA9;
+	}
+	if let Some(opcode) = memory.data.get_mut(0x4243) {
 		*opcode = 0x84;
 	}
 	// end program
 
-	cpu.execute(3, &memory);
+	cpu.execute(9, &mut memory);
 }