CODE (key)
    A 0x01 LDri, ( @KEY )
    0x28 RST,
    PUSHA,
;CODE
CODE (emit) EXX, ( protect BC )
    BC POP, ( c == @DSP arg ) chkPS,
    A 0x02 LDri, ( @DSP )
    0x28 RST,
EXX, ( unprotect BC ) ;CODE
CODE AT-XY EXX, ( protect BC )
    DE POP, H E LDrr, ( Y )
    DE POP, L E LDrr, ( X ) chkPS,
    A 0x0f LDri, ( @VDCTL ) B 3 LDri, ( setcur )
    0x28 RST,
EXX, ( unprotect BC ) ;CODE