From f760b96d19ace7eef91d3f3e0e96d42764991e45 Mon Sep 17 00:00:00 2001
From: John <j@soft.fish>
Date: Tue, 9 Jul 2024 01:06:47 -0500
Subject: [PATCH] POP: Don't allow F.low to be set

---
 src/cpu.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cpu.rs b/src/cpu.rs
index 1b5e46a..28dcd69 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -624,6 +624,9 @@ mod instructions {
         }
         pub fn insn_pop(&mut self, reg: R16Stack, bus: &mut impl BusIO) -> IResult {
             self[reg].0 = self.pop16(bus)?;
+            if let R16Stack::AF = reg {
+                self.af.wide_mut().0 &= 0xfff0; // lo flags should never be set
+            }
             Ok(())
         }
     }