MON 60B 055B - ISPLACE (START-PLACE)

Begins a place operation by clearing the 55REP bit in the caller process message-buffer flags word (in the 5MPM message buffer).

Status: dispatch byte-verified; body from 5P-P2-MON60.NPL (.npl); L07 body loc pending.

Handler (verbatim in .npl)

• X:=5PRDESCR.MESSBUFF - caller process descriptor message buffer.
• *AAX 5MSFL; IOF; LDATX - address flags word 5MSFL in bank 5MBBANK; load it (interrupts off).
• A BZERO 55REP; *STATX; ION - clear the 55REP bit and store back.
• GO FAR 5NOPAR.

Byte status

VERIFIED: dispatch + 5IFUNC[055]. From NPL: body. PENDING: L07 body address. Touches the 5MPM message buffer - relevant to Phase 3 bus interface.