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cc65/libsrc/plus4/slow.s

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;
; Marco van den Heuvel, 2018-03-28
;
; void slow (void);
; /* Switch the CPU into single clock mode. */
;
.export _slow
.include "plus4.inc"
.proc _slow
lda TED_CLK
ora #%00000010
sta TED_CLK
rts
.endproc