SPRES

MON 60 subfunction 043B (octal) = 0x23 = 35 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL, via SUBFUNCTION-TABLE.md): RESERVE ND-500 CPU/SYSTEM FOR SPECIAL USE, server handler ISRES. Client name (yaml 60B_N500M.yaml): SPRES, "Reserve for special use", params (none).

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 (PROVEN)

146467 SAA 43 / 146470 JMP I 1 / 146471 146244 (gateway). Verified from bytes.

Call site (PROVEN)

Call site	Enclosing routine	Resolution	Kind
007474 JPL I 130	interpreter ENTER 002662 (fs 000331=217), case 007450-007476	ptr 007624=146467	interpreter case

Parameter block filled before the call

Slot	Store	Value	yaml field
,X 6	007473 STD ,X 6	(B-127) (word computed at 007467/007470)	yaml says (none) - see discrepancy

Skip / error handling

• ERROR (callsite+1): 007475 JPL -41 -> 007434 (local error-handler code).
• SUCCESS (callsite+2): 007476 JMP I -100 -> ptr 007376 = 010613 (command loop).

Unknown / inferred

• DISCREPANCY (PROVEN vs yaml): the yaml documents SPRES with no parameters, yet this binary stores one word (local B-127) into gateway slot ,X 6 right before the call (007473 STD ,X 6, PROVEN). The word's meaning is unknown; the NPL is a different build revision. Recorded, not resolved - do not assume it is ignored.
• INFERRED (role): 007434 local error handler; 010613 command loop (entries PROVEN).
• The 007464/007465 double sub-call preceding the param setup was not traced.