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cc65/libsrc/c64/get_ostype.s

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;
; Stefan Haubenthal, Jul 10 2003
;
; unsigned char get_ostype(void)
;
; $AA US
; $64 PET-64
; $43 SX-64
; $03 EU_NEW
; $00 EU_OLD
;
.export _get_ostype
.proc _get_ostype
ldx #$00 ; Clear high byte
lda $ff80
rts
.endproc