MSTCL

MON 60 subfunction 035B (octal) = 0x1D = 29 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL, via SUBFUNCTION-TABLE.md): (master clear), server handler 5NOPAR. Client name (yaml 60B_N500M.yaml): MSTCL, "Master clear", params (none).

Operator-command note: INDEX.md section 2.1 maps this to MASTER-CLEAR (PROVEN there).

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

Thunk (PROVEN)

146456 SAA 35 / 146457 JMP I 1 / 146460 146244 (gateway). Verified from bytes.

Call sites (all PROVEN)

Call site	Enclosing routine	Resolution	Kind
005736 JPL I 173	interpreter ENTER 002662 (fs 000331=217), case 005736-005740	ptr 006131=146456	interpreter case
005744 JPL I 165	interpreter ENTER 002662, case 005744-005746	ptr 006131=146456	interpreter case
122514 JPL I 6	ENTER 122507 (framesize 000000=0)	ptr 122522=146456	standalone ENTER

Parameter block

MSTCL takes no parameters (yaml (none)). No ,X slot is stored before any of the three call sites - PROVEN by inspection.

Skip / error handling

Site	ERROR (callsite+1)	SUCCESS (callsite+2)
A 005736	005737 JPL I -35 -> ptr 005702 = 002673 (interpreter error)	005740 JMP I -7 -> ptr 005731 = 010613 (command loop)
B 005744	005745 JPL I -43 -> ptr 005702 = 002673	005746 JMP I -15 -> ptr 005731 = 010613
C 122514	122515 JPL I 4 -> ptr 122521 = 177327 LEAVE(value)	122516 JPL I 5 -> ptr 122523 = 177335 LEAVE-SKIP

Unknown / inferred

• PROVEN: site C (122514) is reached as the fall-through SUCCESS of MSTOP (122512) in the same routine 122507 - a micro-stop then master-clear sequence (see 034B-MSTOP).
• The two interpreter cases (005736, 005744) both target thunk via pool word 006131; both use the interpreter's shared error routine 002673 and command loop 010613. Why the interpreter has two separate MSTCL cases is unknown (not traced; likely two distinct operator commands both needing a master-clear).