fix: jump issue

src/cpu.rs

@@ -96,7 +96,8 @@ impl Cpu {
 
         let (instruction_fn, instruction_time, instruction_str) = instruction;
 
-        if !self.mmu.boot_active() || *instruction_str == "! UNIMP !" {
+        // if !self.mmu.boot_active() {
+        if *instruction_str == "! UNIMP !" {
             println!(
                 "{}\t(0x{:02x})\t${:04x} {}",
                 instruction_str, opcode, pc, is_prefix

src/inst.rs

@@ -852,7 +852,7 @@ fn ld_sp_u16(cpu: &mut Cpu) {
 }
 
 fn jr_nc_i8(cpu: &mut Cpu) {
-    let byte = cpu.read_u8();
+    let byte = cpu.read_u8() as i8;
 
     if cpu.get_carry() {
         return;
@@ -879,7 +879,7 @@ fn scf(cpu: &mut Cpu) {
 }
 
 fn jr_c_i8(cpu: &mut Cpu) {
-    let byte = cpu.read_u8();
+    let byte = cpu.read_u8() as i8;
 
     if !cpu.get_carry() {
         return;