CODE I
    L 0 IX+ LDrIXY, H 1 IX+ LDrIXY,
    HL PUSH,
;CODE
CODE I'
    L 2 IX- LDrIXY, H 1 IX- LDrIXY,
    HL PUSH,
;CODE
CODE J
    L 4 IX- LDrIXY, H 3 IX- LDrIXY,
    HL PUSH,
;CODE
CODE >R
    HL POP, chkPS,
    IX INCd, IX INCd, 0 IX+ L LDIXYr, 1 IX+ H LDIXYr,
;CODE