14 lines
377 B
ArmAsm
14 lines
377 B
ArmAsm
|
|
iec_release_clk_data:
|
|
|
|
;; Released CLK = DATA considered valid; for extra robustness on non-emulated
|
|
;; hardware give some lines few more cycles to stabilize; see page 10 of
|
|
;; http://www.zimmers.net/anonftp/pub/cbm/programming/serial-bus.pdf
|
|
|
|
lda CI2PRA
|
|
and #$FF - BIT_CI2PRA_DAT_OUT ; release
|
|
sta CI2PRA
|
|
and #$FF - BIT_CI2PRA_CLK_OUT ; release
|
|
sta CI2PRA
|
|
rts
|