ldh a, [$ff01] ;$00a4
ldh [$ffd0], a ;$00a6
ldh a, [$ffcb] ;$00a8
cp $29 ;$00aa
ret z ;$00ac
ldh a, [$ffcf] ;$00ad
ldh [$ff01], a ;$00af
ld a, $ff ;$00b1
ldh [$ffcf], a ;$00b3
ld a, $80 ;$00b5
ldh [$ff02], a ;$00b7
ret ;$00b9
;---------------------------------------
ldh a, [$ff01] ;$00ba
ldh [$ffd0], a ;$00bc
ldh a, [$ffcb] ;$00be
cp $29 ;$00c0
ret z ;$00c2
ldh a, [$ffcf] ;$00c3
ldh [$ff01], a ;$00c5
ei ;$00c7
call $0a98 ;$00c8
ld a, $80 ;$00cb
ldh [$ff02], a ;$00cd
ret ;$00cf
;---------------------------------------
ldh a, [$ffcd] ;$00d0
cp $02 ;$00d2
ret nz ;$00d4
xor a ;$00d5
ldh [$ff0f], a ;$00d6
ei ;$00d8
ret ;$00d9
;---------------------------------------
But not the conditional rets
e.g.