From b8cb5301fd61b2c9d7fc717377a2b4b9c835a876 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Sun, 3 Jul 2022 06:14:50 +0100
Subject: [PATCH] feat: new instruction
---
src/inst.rs | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/inst.rs b/src/inst.rs
index e3a4eda1..152ecd84 100644
--- a/src/inst.rs
+++ b/src/inst.rs
@@ -223,7 +223,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(noimpl, 4, "! UNIMP !"),
(rst_08h, 16, "RST 08h"),
// 0xd opcodes
- (noimpl, 4, "! UNIMP !"),
+ (ret_nc, 8, "RET NC"),
(pop_de, 12, "POP DE"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
@@ -1180,6 +1180,15 @@ fn rst_08h(cpu: &mut Cpu) {
rst(cpu, 0x0008);
}
+fn ret_nc(cpu: &mut Cpu) {
+ if cpu.get_carry() {
+ return;
+ }
+
+ cpu.pc = cpu.pop_word();
+ cpu.ticks = cpu.ticks.wrapping_add(12);
+}
+
fn pop_de(cpu: &mut Cpu) {
let word = cpu.pop_word();
cpu.set_de(word);
--
GitLab