160B PLACE SEGMENT (NEW FORMAT)

MON 60 subfunction 160B (octal) = 0x70 = 112 dec.

Authoritative purpose (SUBFUNCTION-TABLE.md / 5P-P2-MON60.NPL): LOAD (PLACE) ONE SEGMENT (NEW DOMAIN FORMAT) (IN5SEGLOAD). Server handler: IN5SEGLOAD.

All addresses are OCTAL ND-100 word addresses, BANK 1, base 0. Source: SINTRAN/ND500/nd-500-mon/nd-500-mon-j04.prog.asm

Thunk 147000 = SAA 160 ; JMP I 1 ; 146244 (gateway). Confirmed verbatim in the .asm.

Handler location(s)

Call site	Enclosing ENTER-routine	Framesize	Error path (callsite+1)	Success path (callsite+2)
060562	060374	000004	060563 JMP I ,B-155 -> ptr 060406 = 032006 (frame-relative error exit)	060564 continues
061135	060374	000004	061136 JMP I ,B-155 -> ptr 060761 = 047060	061137 continues

Every call site resolves as JPL I <disp> -> EA=P+disp -> bank1[EA] = pointer word = thunk 147000 (PROVEN by resolving the pointer word).

Parameter block filled before the call

Call site 060562 (in 060374):

• param1 (,X 6) = A from 060546 LDA 64; store 060550.
• param2 (,X 7) = &(B-150); 060551/060552/060553.
• param3 (,X 10) = A from 060554 LDA 57; store 060555.
• param4 (,X 11) = 3-word float (060556 SAA 36 / 060560 LDT 54 / 060561 STF ,X 11).

Call site 061135 (in 060374):

• param1 (,X 6) = A from 061121 LDA 142; store 061123.
• param2 (,X 7) = &(B-150); store 061126.
• param3 (,X 10) = A from 061127 LDA 135; store 061130.
• param4 (,X 11) = 3-word float; store 061134.

The block base is X := ,B -176 (stack top = base of the gateway frame); slot ,X n becomes MON 60 parameter n-5 (PROVEN convention, prog.md sec 4.4).

What the caller does

Two call sites in the same routine (060374). Each passes four params: two scalar words, a local-address pointer (&B-150), and a 3-word float image - the new-domain-format segment descriptor. Field semantics INFERRED.

Unknown / inferred

• INFERRED: the four params form a segment-load descriptor (new domain format); exact fields not read from server source.

Number bases

160B octal = 0x70 = 112 dec.