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cc65/libsrc/plus4/isfast.s

23 lines
316 B
ArmAsm

;
; Marco van den Heuvel, 2018-03-20
;
; unsigned char isfast (void);
; /* Returns 1 if the CPU is in double clock mode. */
;
.export _isfast
.include "plus4.inc"
.proc _isfast
lda TED_CLK
lsr
and #$01
ldx #$00
rts
.endproc