LIST-SYSTEM-PARAMETERS

MON 60 subfunction RSYSP = 103B (octal) = 0x43 = 67 decimal. NPL purpose (authoritative, 5P-P2-MON60.NPL): READ SYSTEM VARIABLES (server handler IRSYSP). yaml: RSYSP "Read system parameters", param <parameter array>.

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

Handler location

Item	Value	Status
Handler	STANDALONE ENTER-routine at 073115 (framesize 000336 = 222 locals), spans 073115..073411	PROVEN
MON 60 call site (103B)	073132 JPL I 160 -> ptr 073312, bank1[073312]=146624 = thunk SAA 103	PROVEN
Error path (103B)	073133 -> ptr 073313 = LEAVE(value) 177327	PROVEN
Success	fall-through 073134; routine success -> LEAVE-SKIP 177335 (via 073330/073405)	PROVEN
Internal dispatch	073263-073265 LDX ,B -170 / LDX I ,X 43 / JMP ,X 0 (jump-table select)	PROVEN

MON 60 subfunction(s) used (all PROVEN by thunk resolution)

Subfn	Octal / Hex	Thunk	Purpose	Site	Parameter-block layout (yaml params)	Skip/Error
RSYSP	103B / 0x43	146624	READ SYSTEM VARIABLES	073132	,X 6 = &sysarr (@B-157) [<parameter array>]	err=073133->LEAVE(val)
RDSWP	121B / 0x51	146665	Read from swapper	073152	,X 6=[155] <no.bytes>; ,X 7=[153] <ND-500 addr>; ,X 10=&(B-122) <data area>; ,X 11=&(B-130) <bytes read>	err=073153->LEAVE(val)
WSYSP	104B / 0x44	146627	Write system parameters	073354	,X 6 = &sysarr (@B-167)	err=073355->LEAVE(val)
TOSWP	76B / 0x3E	146610	Send message to swapper	073362	,X 6 = &record (@B-167)	err=073363->LEAVE(val); ok=073364->LEAVE-SKIP

Byte citations: 073312=146624 (RSYSP thunk, SAA 103); 073316=146665 (RDSWP); 073402=146627 (WSYSP); 073404=146610 (TOSWP).

What it does

1. Always: reads the ND-500 system variables via MON 60 RSYSP (103B), passing a pointer to a local array. (073125-073132)
2. Always: reads a block from the swapper via MON 60 RDSWP (121B) with the full four-argument signature (byte count, ND-500 address, data-area pointer, bytes-read pointer). (073137-073152)
3. Formats the collected values for the operator terminal via helper routines (054045, 000067, 054430, 030060, 001726; none are MON calls).
4. An internal jump table (073264-073265) then selects a follow-up branch:
   • the WRITE branch issues MON 60 WSYSP (104B) at 073354;
   • the SEND branch issues MON 60 TOSWP (76B) at 073362. These two are mutually-exclusive branches, not always executed.
5. Errors from any MON 60 unwind to LEAVE(value); success takes LEAVE-SKIP.

How it fits ND-500 init

This is the operator's read/adjust command for the ND-500 monitor's system variables: it reads the live system variables and a swapper block, displays them, and (on the write branch) can push updated parameters back and message the swapper. It sits with the swapper/system-tuning group used while configuring a running ND-500.

Unknown / inferred

• INFERRED: local @B-157 = the system-variable array (the RSYSP <parameter array>); the address arithmetic (AAA -167 ; AAA 10) is PROVEN, the semantic label follows the yaml.
• INFERRED: globals [153]/[155] are the ND-500 address and byte count handed to RDSWP; addresses PROVEN, roles from the RDSWP signature.
• INFERRED (jump-table cases): the WRITE/SEND labels for the internal dispatch are named from the subfunctions on each branch; the selector's value->branch mapping was not fully enumerated.
• PROVEN: exactly these four MON 60 subfunctions are issued inside 073115..073411; no MON instructions appear.