From: Marco van den Heuvel <blackystardust68@yahoo.com>
Date: Sat, 14 Apr 2018 18:31:28 +0000 (-0700)
Subject: Fixed an issue with the changing the d040 value while detecting.
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=cb04bc54655c0b6e66e54cf924a9cee017872af9;p=cc65

Fixed an issue with the changing the d040 value while detecting.
---

diff --git a/libsrc/c64/acc_detect_c64dtv.s b/libsrc/c64/acc_detect_c64dtv.s
index ce30806db..1734095b1 100755
--- a/libsrc/c64/acc_detect_c64dtv.s
+++ b/libsrc/c64/acc_detect_c64dtv.s
@@ -18,7 +18,7 @@
 _detect_c64dtv:
         ldy     C64DTV_Extended_Regs
         lda     #$00
-        tax
+        ldx     $D000
 
 ; Make sure the CPU is a 6510
         .byte   $1A                   ; NOP on 8502, INA on 65(S)C(E)02, 4510 and 65816
@@ -27,17 +27,18 @@ _detect_c64dtv:
         sta     C64DTV_Extended_Regs
 
 ; Check if $D000 is mirrored at $D040
-        lda     $D040
-        cmp     $D000
+        cpx     $D040
         bne     found
-        inc     $D040
-        cmp     $D000
+        inc     $D000
+        cpx     $D040
         bne     not_found
 found:
         lda     #$01
         .byte   $2C
 not_found:
         lda     #$00
+        stx     $D000
+        ldx     #$00
         sty     C64DTV_Extended_Regs
         rts