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db 71 in a, ($71) ; 拡張ROMセレクト
f5 push af
3e ff ld a, $ff ; メインROM
d3 71 out ($71), a
; putc
3e xx ld a, xx
df rst $18 ; OUTIO
f6 xx or xx
df rst $18
; puts
21 xx xx ld hl, xxxx
cd 50 55 call $5550
f1 pop af
d3 71 out ($71), a
c9 ret
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