021B-WHO¶

MON 60 subfunction WHO = 21B (octal) = 0x11 = 17 decimal. NPL purpose (authoritative, SUBFUNCTION-TABLE.md): (who is on). Server handler: 5NOPAR (generic forward path).

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

Thunk (PROVEN, from bytes)¶

Addr	Word	Meaning
146373	170421	`SAA 21` -> subfunction code 021 (17 dec)
146374	125001	`JMP I 1`
146375	146244	-> gateway

Call sites¶

Call site	Enclosing routine	JPL	Pointer word	Thunk	Status
005165	CASE 005165-005167 inside command interpreter 002662 (spans 002662-010634)	`JPL I 56` -> 005243	`bank1[005243]=146373`	`SAA 21`	PROVEN
007445	local sub-block 007434-007447 inside command interpreter 002662 (entered with L as return link, returns via `JMP I ,B 111`)	`JPL I 146` -> 007613	`bank1[007613]=146373`	`SAA 21`	PROVEN

Both sit inside the 002662 interpreter frame. 007445 is inside a small local subroutine block (007434 RADD CLD SL DX saves L to B+111; the block is reached by JMP and returns via JMP I ,B 111 at 007447) - it is NOT a separate ENTER routine.

Parameter block (X := b.-176)¶

Neither site stores a parameter into the block. WHO is issued directly, consistent with 5NOPAR.

Skip / error handling¶

005165: err 005166 (JPL I -147->005017 = routine 002673); ok 005167 (JMP I 43->005232 = routine 010613 command loop).
007445: guarded - executed only when the result of the prior call at 007437 equals the constant at [007612] (LDA ,B -173 / LDT 150 / SKP IF DA EQL ST at 007441-007444). err 007446 (JPL I 140->007606); ok 007447 (JMP I ,B 111->007560, returns via saved link).

Unknown / inferred¶

UNKNOWN: the routine reached by JPL I 152->007611 at 007437 (whose result gates the WHO call), and the meaning of the constant at [007612].
UNKNOWN: how WHO's output is collected (no result-buffer pointer placed by either case).
PROVEN: thunk bytes, both pointer resolutions to 146373, both call sites, absence of ,X stores, and the callsite+1/+2 targets.