pokecrystal-board/home/handshake.asm

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AskSerial:: ; 2063
; send out a handshake while serial int is off
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ld a, [wc2d4]
bit 0, a
ret z
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ld a, [wc2d5]
and a
ret nz
; once every 6 frames
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ld hl, wca8a
inc [hl]
ld a, [hl]
cp 6
ret c
xor a
ld [hl], a
ld a, $c
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ld [wc2d5], a
; handshake
ld a, $88
ld [rSB], a
; switch to internal clock
ld a, %00000001
ld [rSC], a
; start transfer
ld a, %10000001
ld [rSC], a
ret
; 208a