Added get_tv for several platforms

git-svn-id: svn://svn.cc65.org/cc65/trunk@1709 b7a2c559-68d2-44c3-8de9-860c34a00d81
2002-12-03 22:19:21 +00:00
parent 6ad3b3078f
commit df956f4628
11 changed files with 132 additions and 0 deletions
--- a/libsrc/plus4/get_tv.s
+++ b/libsrc/plus4/get_tv.s
@@ -0,0 +1,28 @@
+;
+; Ullrich von Bassewitz, 2002-12-03
+;
+; unsigned char __fastcall__ get_tv (void);
+; /* Return the video mode the machine is using */
+;
+
+        .export         _get_tv
+
+        .include        "plus4.inc"
+
+
+;--------------------------------------------------------------------------
+; _get_tv
+
+.proc   _get_tv
+
+        ldx     #$01            ; Assume PAL
+        bit     TED_MULTI1      ; Test bit 6
+        bvc     pal
+        dex                     ; NTSC
+pal:    txa
+        ldx     #0
+        rts
+
+.endproc
+
+