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cc65/libsrc/tgi/tgi_setviewpage.s

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;
; Ullrich von Bassewitz, 22.06.2002
;
; void __fastcall__ tgi_setviewpage (unsigned char page);
; /* Set the visible page. */
.include "tgi-kernel.inc"
.export _tgi_setviewpage
_tgi_setviewpage:
cmp _tgi_pagecount ; Compare to available pages
bcs @L1
jmp tgi_setviewpage ; Call the driver
@L1: jmp tgi_inv_arg ; Invalid argument