064B-HISTP

MON 60 subfunction HISTP = 64B = 0x34 = 52 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): STOP HISTOGRAM, server handler ISTOHIAT.

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

60B yaml client name = HISTP (STOP-HISTOGRAM command). Sits in the same interpreter histogram block as HISTA (063B @010440) and HIREL (066B @010443).

Thunk (PROVEN, bytes read)

Addr	Word	Meaning
146552	170464	SAA 64 (subfunction 64B)
146553	125001	JMP I 1 (-> gateway pointer)
146554	146244	pointer to gateway 146244

Call site(s)

Item	Value	Status
MON 60 call site	010435 JPL I 66 -> ptr 010523, bank1[010523]=146552 = thunk SAA 64	PROVEN
Error path (callsite+1)	010436 JPL I -160 -> routine 007500 (internal error/abort helper)	PROVEN
Success path (callsite+2)	010437 JMP 154 -> routine 010613 (command loop)	PROVEN
Enclosing ENTER routine	002662 (framesize 000331) - the command interpreter	PROVEN (prologue RADD AD1 CLD SL DX+ENTER)

Parameter block (PROVEN stores)

Slot	Store	Value
(none)	--	no ,X parameter store immediately precedes this call site

Gateway convention (prog.md sec 4.4): LDX ,B -176 sets X = stack top; STx ,X 6/7/10 are MON 60 parameters 1/2/3.

What it does

1. Issues MON 60 HISTP to stop the running histogram. (010435)
2. No per-call parameter is written into the gateway block immediately before the call (PROVEN by inspection).
3. On error -> 007500; on success -> command loop 010613.

Unknown / inferred

• PROVEN: no ,X 6/7/10 store precedes 010435.
• INFERRED (role): 007500 internal error/abort helper; 010613 command loop.
• INFERRED: STOP HISTOGRAM / ISTOHIAT from SUBFUNCTION-TABLE.md; thunk SAA 64 PROVEN.
• NOTE: SUBFUNCTION-TABLE.md spells the handler ISTOHIAT (verbatim from the NPL source).

octal=hex=decimal: 64B = 0x34 = 52 decimal