RFLAG

MON 60 subfunction RFLAG = 100B (octal) = 0x40 = 64 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): READ FLAGS FROM ND-500 DATA SEGMENT, server handler RRFLAG.

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 (RFLAG). 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	005264 JPL I 165 -> ptr 005451, bank1[005451]=146616 = thunk SAA 100	PROVEN
Error path	005265 (callsite+1) JPL I -35 -> ptr 005230 = routine 002673	PROVEN
Success path	005266 (callsite+2) LDD ,B -127 (reads back local B-127)	PROVEN

MON 60 subfunction used

Subfn	Octal / Hex / Dec	Thunk	Parameter-block layout	Skip/Error
RFLAG	100B / 0x40 / 64	146616	,X 6 = &(B-125) [005257-005260]; ,X 7 = &(B-127) [005261-005263], B-127 preloaded with constant LDD 174 @005253	err=005265 -> 002673; ok=005266

Thunk bytes (verified): 146616=170500 (SAA 100), 146617=125001, 146620=146244.

What it does

1. Loads a constant into local B-127 (005253 LDD 174; 005254 STD ,B -127).
2. Stores &(B-125) into param slot 1 and &(B-127) into param slot 2. (005255-005263)
3. Issues MON 60 RFLAG. (005264)
4. On error -> 002673; on success reads the flags back from B-127 (005266).

Unknown / inferred

• PROVEN: two parameter words; B-127 is preloaded with a constant before the call and read back after success (005266 LDD ,B -127).
• INFERRED: B-127 is the flags word (server writes the flags there; the preload is a default/selector) and B-125 is a second parameter (e.g. a segment or index). The stores and offsets are PROVEN; the semantic split rests on the purpose string.
• INFERRED (role): 002673 is the interpreter error reporter (PROVEN target).