065B-HISTN

MON 60 subfunction HISTN = 65B = 0x35 = 53 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): READ HISTOGRAM, server handler IREAHIST.

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 = HISTN (PRINT-HISTOGRAM command per INDEX.md 2.2).

Thunk (PROVEN, bytes read)

Addr	Word	Meaning
146555	170465	SAA 65 (subfunction 65B)
146556	125001	JMP I 1 (-> gateway pointer)
146557	146244	pointer to gateway 146244

Call site(s)

Item	Value	Status
MON 60 call site	040437 JPL I 163 -> ptr 040622, bank1[040622]=146555 = thunk SAA 65	PROVEN
Error path (callsite+1)	040440 JPL I 163 -> routine 177327 = LEAVE-with-value (propagates error code)	PROVEN
Success path (callsite+2)	040441 (fall through) LDD I 163	PROVEN
Enclosing ENTER routine	040422 (framesize 000243) - a standalone ENTER routine	PROVEN (prologue RADD AD1 CLD SL DX+ENTER)

Parameter block (PROVEN stores)

Slot	Store	Value
,X 6 (+7,+10)	040436 STF ,X 6	parameter 1 = F-register descriptor (3 words)

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. Loads a descriptor into the F register (3 words) and stores it as parameter 1. (040432-040436)
2. Issues MON 60 HISTN to read back histogram data. (040437)
3. On error LEAVEs with the error code (177327); on success falls through to consume the returned data.

Unknown / inferred

• PROVEN: param 1 = F-register descriptor (STF ,X 6, 3 words).
• UNKNOWN: the F descriptor contents (buffer/name) at HISTN time - not carved.
• PROVEN (role): 177327 = LEAVE-with-value.
• INFERRED: READ HISTOGRAM / IREAHIST from SUBFUNCTION-TABLE.md; thunk SAA 65 PROVEN.

octal=hex=decimal: 65B = 0x35 = 53 decimal