063B-HISTA

MON 60 subfunction HISTA = 63B = 0x33 = 51 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): START HISTOGRAM, server handler ISTAHIST.

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 = HISTA (START-HISTOGRAM command). This call site sits in the interpreter's histogram block 010432-010445 alongside HISTP (064B @010435) and HIREL (066B @010443); those have their own folders.

Thunk (PROVEN, bytes read)

Addr	Word	Meaning
146547	170463	SAA 63 (subfunction 63B)
146550	125001	JMP I 1 (-> gateway pointer)
146551	146244	pointer to gateway 146244

Call site(s)

Item	Value	Status
MON 60 call site	010440 JPL I 64 -> ptr 010524, bank1[010524]=146547 = thunk SAA 63	PROVEN
Error path (callsite+1)	010441 JPL I -163 -> routine 007500 (internal error/abort helper)	PROVEN
Success path (callsite+2)	010442 JMP 151 -> 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 HISTA to start the previously defined histogram. (010440)
2. No per-call parameter is written into the gateway block immediately before the call (PROVEN by inspection): START-HISTOGRAM carries no operand here.
3. On error -> 007500; on success -> command loop 010613.

Unknown / inferred

• PROVEN: no ,X 6/7/10 store precedes 010440.
• INFERRED (role): 007500 internal error/abort helper; 010613 command loop.
• INFERRED: START HISTOGRAM / ISTAHIST from SUBFUNCTION-TABLE.md; thunk SAA 63 PROVEN.
• The window shown (010435-010442) includes the preceding HISTP (064B) call at 010435 for context; HISTP is carved in ../064B-HISTP/.

octal=hex=decimal: 63B = 0x33 = 51 decimal