From d116eb7655774fb8cabedb81e38645238d100751 Mon Sep 17 00:00:00 2001
From: Irmen de Jong <irmen@razorvine.net>
Date: Tue, 6 Apr 2021 23:55:20 +0200
Subject: [PATCH] paranoid, be sure to not kill carry

---
 compiler/res/prog8lib/diskio.p8 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/res/prog8lib/diskio.p8 b/compiler/res/prog8lib/diskio.p8
index 3faf8fb8b..2617f4466 100644
--- a/compiler/res/prog8lib/diskio.p8
+++ b/compiler/res/prog8lib/diskio.p8
@@ -365,6 +365,7 @@ io_error:
         c64.SETNAM(string.length(filenameptr), filenameptr)
         c64.SETLFS(1, drivenumber, 0)
         uword end_address = address + size
+        first_byte = 0      ; result var reuse
 
         %asm {{
             lda  address
@@ -381,7 +382,6 @@ io_error:
             plp
         }}
 
-        first_byte = 0      ; result var reuse
         if_cc
             first_byte = c64.READST()==0