SPFLAG

MON 60 subfunction SPFLAG = 101B (octal) = 0x41 = 65 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): WRITE FLAGS INTO ND-500 DATA SEGMENT, server handler WWFLAG.

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

Named by subfunction (SPFLAG). No operator command name is invented here.

Handler location

Item	Value	Status
Enclosing ENTER-routine	002662 (framesize 000331) - main command interpreter	PROVEN
MON 60 call site	005223 JPL I 24 -> ptr 005247, bank1[005247]=146621 = thunk SAA 101	PROVEN
Error path	005224 (callsite+1) JPL I 4 -> ptr 005230 = routine 002673	PROVEN
Success path	005225 (callsite+2) JMP I 5 -> ptr 005232 = routine 010613 (command loop)	PROVEN

MON 60 subfunction used

Subfn	Octal / Hex / Dec	Thunk	Parameter-block layout	Skip/Error
SPFLAG	101B / 0x41 / 65	146621	,X 6 = &(B-125) [005216-005217]; ,X 7 = &(B-127) [005220-005222]. B-125 and B-127 are two command-line numeric operands evaluated at 005204-005213	err=005224 -> 002673; ok=005225 -> 010613

Thunk bytes (verified): 146621=170501 (SAA 101), 146622=125001, 146623=146244.

What it does

1. Evaluates two command-line numeric operands (SAA 0 then SAA 1 selectors, helper calls at 005205/005211) into locals B-125 and B-127. (005204-005213)
2. Stores &(B-125) and &(B-127) into gateway param slots 1 and 2. (005214-005222)
3. Issues MON 60 SPFLAG to write the flags into the ND-500 data segment. (005223)
4. On error -> 002673; on success -> command loop 010613.

Unknown / inferred

• PROVEN: two parameter words; both filled from evaluated command-line operands.
• INFERRED: the two operands are (flag value, target selector/segment) - the natural WRITE-FLAGS pair. The evaluation helper and operand order were not fully traced; the stores and the SAA 0/SAA 1 selectors are PROVEN.
• INFERRED (roles): 002673 = interpreter error reporter, 010613 = command loop (PROVEN targets).