Added a way to show the default mouse pointer on C64 TGI (graphics) screens.

libsrc/c64/extra/tgimousedata.s

@@ -0,0 +1,21 @@
+; C64 sprite addresses for the TGI mouse pointer
+;
+; 2017-01-13, Greg King
+
+; In order to provide a visible mouse pointer during TGI's graphics mode,
+; the object file "c64-tgimousedata.o" must be linked explicitly into
+; a program file.  Example:
+;
+; cl65 -t c64 -o program-file main-code.c subroutines.s c64-tgimousedata.o
+;
+; Note:  Currently, a program cannot have default
+; pointers for both text and graphic modes.
+
+; The TGI graphics mode uses VIC-II's 16K bank number three.
+;
+; Address of the TGI bitmap's color RAM
+
+COLORMAP        :=      $D000
+
+        .export         mcb_spritepointer := COLORMAP + $03F8
+        .export         mcb_spritememory  := COLORMAP + $0400