SPRIO

MON 60 subfunction SPRIO = 105B (octal) = 0x45 = 69 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): SET PRIORITY, server handler 5NOPAR (generic input path).

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

Named by subfunction (SPRIO). No operator command name is invented here.

Handler location - three call sites

All three lie in the main command interpreter routine 002662 (framesize 000331) and each marshals three parameters (pointers to three evaluated operands stored at frame locals B+105, B+107, B+112).

Call site	JPL	ptr -> thunk	,X 6	,X 7	,X 10	Error (callsite+1)	Success (callsite+2)	Status
006406	JPL I 147	006555 -> 146632	&(B+105) [006334]	&(B+107) [006367]	&(B+112) [006405]	006407 JPL I 145 -> 006554 = 002673	006410 JMP I -45 -> 006343 = 010613	PROVEN
006444	JPL I 111	006555 -> 146632	&(B+105) [006420]	&(B+107) [006436]	&(B+112) [006443]	006445 JPL I 107 -> 006554 = 002673	006446 JMP I -103 -> 006343 = 010613	PROVEN
006513	JPL I 42	006555 -> 146632	&(B+105) [006456]	&(B+107) [006474]	&(B+112) [006512]	006514 JPL I 40 -> 006554 = 002673	006515 JMP I -152 -> 006343 = 010613	PROVEN

All three resolve to the single SPRIO thunk 146632, share the same pointer word 006555, converge their error paths on 002673 (pointer word 006554) and their success paths on the command loop 010613 (pointer word 006343).

Thunk bytes (verified): 146632=170505 (SAA 105), 146633=125001, 146634=146244.

MON 60 subfunction used

Subfn	Octal / Hex / Dec	Thunk	Parameter-block layout	Skip/Error
SPRIO	105B / 0x45 / 69	146632	3 words: ,X 6=&(B+105), ,X 7=&(B+107), ,X 10=&(B+112) - pointers to three evaluated command operands	err -> 002673; ok -> 010613

What it does

Each of the three cases evaluates three command operands into locals B+105, B+107, B+112, stores their addresses into gateway param slots 1/2/3, and issues MON 60 SPRIO to set the process priority. Error -> 002673; success -> command loop 010613.

Unknown / inferred

• PROVEN: three parameter words at each site (,X 6, ,X 7, ,X 10).
• INFERRED: the three operands are the SET-PRIORITY arguments (e.g. process id, priority value, and a third field). The evaluation and operand semantics were not traced; the stores and offsets are PROVEN. Why three separate near-identical cases exist (different command variants) was not resolved.
• INFERRED (roles): 002673 = interpreter error reporter, 010613 = command loop (PROVEN targets).