CODE (spix) ( n -- n )
    HL POP,
    chkPS,
    A L LDrr,
    SPI_DATA OUTiA,
    NOP, NOP, ( let SPI relay breathe )
    SPI_DATA INAi,
    L A LDrr,
    HL PUSH,
;CODE
CODE (spie) SPI_CSLOW OUTiA, ;CODE
CODE (spid) SPI_CSHIGH OUTiA, ;CODE