From 708a6d983177f63cf4bc39b693c3a324353a6feb Mon Sep 17 00:00:00 2001
From: Nathaniel Walizer <robots.are.love@gmail.com>
Date: Sun, 31 Aug 2025 11:25:54 -0700
Subject: [PATCH] Fix status register saved on interrupt

---
 src/f6502.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/f6502.c b/src/f6502.c
index 74a51d1..2a422b5 100644
--- a/src/f6502.c
+++ b/src/f6502.c
@@ -434,7 +434,7 @@ static inline int f6502_interrupt(f6502_Core* core,
                                   uint16_t addr) {
     PUSH16(core, core->registers.S, core->registers.PC);
     PUSH(core, core->registers.S,
-         core->registers.P & ~f6502_Status_B);
+         (core->registers.P & ~f6502_Status_B) | f6502_Status_1);
     SET(core->registers.P, f6502_Status_I);
     core->registers.PC = f6502_read16(&core->memory, addr);
     return 7;