053B-T500P

MON 60 subfunction T500P = 53B = 0x2B = 43 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): (take ND-500 pages), server handler 5NOPAR.

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 = T500P. Cross-reference: call site 010245 is also documented in ../START-SWAPPER/ (paging block 010200-010260). This folder carves the T500P subfunction itself.

Thunk (PROVEN, bytes read)

Addr	Word	Meaning
146522	170453	SAA 53 (subfunction 53B)
146523	125001	JMP I 1 (-> gateway pointer)
146524	146244	pointer to gateway 146244

Call site(s)

Item	Value	Status
MON 60 call site	010245 JPL I 43 -> ptr 010310, bank1[010310]=146522 = thunk SAA 53	PROVEN
Error path (callsite+1)	010246 JPL I 10 -> ptr 010256 = routine 007500 (internal error/abort helper)	PROVEN
Success path (callsite+2)	010247 JMP I -176 -> 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
,X 6	010244 STA ,X 6	parameter 1 = &(B+105) = address of the page-count value evaluated by helper 002003

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. Evaluates one command-line numeric operand via helper 002003 -> a 32-bit value in D, stored to B+105. (010235-010240)
2. Passes &(B+105) as param 1 and issues MON 60 T500P (take pages from the ND-500). (010245)
3. On error -> 007500; on success -> command loop 010613.

Unknown / inferred

• INFERRED: 002003 numeric-arg evaluator (role PROVEN by call pattern).
• PROVEN: param 1 = &(B+105) (010244).
• INFERRED (semantic): B+105 = page count (per NPL (take ND-500 pages)).
• Mirror of 052B G500P; the two form the give/take-pages pair. See ../START-SWAPPER/.

octal=hex=decimal: 53B = 0x2B = 43 decimal