From 5296d394e47a85f941fd6da896745d5ac310def6 Mon Sep 17 00:00:00 2001
From: Dan Sanderson <contact@dansanderson.com>
Date: Fri, 28 Nov 2025 11:09:21 -0800
Subject: [PATCH] Use php/sei/plp to preserve original state of the interrupt
 flag

---
 libsrc/c65/cpeekcolor.s | 3 ++-
 libsrc/c65/cputc.s      | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libsrc/c65/cpeekcolor.s b/libsrc/c65/cpeekcolor.s
index 5737a7503..66bb03f4e 100644
--- a/libsrc/c65/cpeekcolor.s
+++ b/libsrc/c65/cpeekcolor.s
@@ -18,6 +18,7 @@ _cpeekcolor:
         lda     SCREEN_PTR
         sta     ptr1
 
+        php
         sei
         lda     $D030
         ora     #$01
@@ -28,8 +29,8 @@ _cpeekcolor:
         lda     $D030
         and     #$FE
         sta     $D030
-        cli
         tya
+        plp
 
         ldx     #>$0000
         rts
diff --git a/libsrc/c65/cputc.s b/libsrc/c65/cputc.s
index 46b3bddeb..d033ab234 100644
--- a/libsrc/c65/cputc.s
+++ b/libsrc/c65/cputc.s
@@ -116,6 +116,7 @@ putchar:
         adc     #>$D000
         sta     ptr4 + 1
 
+        php
         sei
         lda     $D030
         ora     #$01
@@ -125,6 +126,6 @@ putchar:
         lda     $D030
         and     #$FE
         sta     $D030
-        cli
+        plp
 
         rts