lblpushRS BSET
    IX INCd, IX INCd,
    0 IX+ L LDIXYr,
    1 IX+ H LDIXYr,
    RET,

lblpopRS BSET
    L 0 IX+ LDrIXY,
    H 1 IX+ LDrIXY,
    IX DECd, IX DECd,
    RET,