ND-500 System Monitor - the FUNCS dispatch table (the actual ND-500 operations)

FUNCS = 142031B in 030-S3SM5 is the system monitor's 128-entry operation table, indexed by the MON 60B subfunction code - the server-side twin of the worker's 5IFUNC. Where 5IFUNC[N] marshals the caller's parameters, FUNCS[N] performs the actual ND-500 operation. 5FP2E (the entry) reads the packaged function code and jumps through FUNCS[code].

Byte-verified: dumped from 030-S3SM5.bin (base 40000B); every entry lands on a named N500-SYMBOLS routine; REGRE (entry 0) and the entry code are coherent. Overlay validated (segment's own symbol file + coherent code + release-doc PIT).

ERRFP = 141574B = the error/not-serviced-here handler. Codes that point at ERRFP are handled entirely on the ND-100 side (in N500M/5IFUNC or the resident driver) and have no ND-500-side operation - e.g. reserve/release for special use (043-045), histogram (062-066), most logging (111-115, 124-126), abort (117), which manipulate ND-100 process state, not the ND-500.

The full path (all hops named)

command  -> [caller] thunk SAA <code>  -> gateway -> MON 60
         -> [worker] N500M 5IFUNC[code] (param marshalling) -> 5NOPAR -> FPT2ENTRY
         -> [sysmon] 5FP2E -> FUNCS[code] -> the ND-500 operation (REGRE / PMWRI / CSLOA / ...)

FUNCS table (code -> routine @addr -> operation)

code	routine	addr	operation
000	REGRE	142365	read a register
001	REGWR	142410	write a register
002	PMREA	142456	logical program-memory read
003	DMREA	142465	logical data-memory read
004	PMWRI	142527	logical program-memory write
005	DMWRI	142536	logical data-memory write
006	SGLOA	142637	load (place) one segment
007	LDSWA	143551	load swapper
010	REGSR	146410	read register block
011	REGSW	146426	write register block
012	PROGS	146451	start ND-500 program (RUNN)
013	CONFI	146761	connect file
014	CLOSF	147003	close file
015	RESR5	147014	reserve ND-500 process
016	REL50	147727	release ND-500 process
017	LIOPF	150533	list open files
020	CTUSE	151132	time used
021	WHOIS	151763	who is on
022	SETER	152160	set error flag
023	CSREA	152165	read control store
024	CSWRI	152373	write control store
025	MPSTA	152616	micro start
026	DMEXA	153051	data-memory examine (4 bytes)
027	DMDEP	153107	data-memory deposit
030	PMEXA	153042	program-memory examine (4 bytes)
031	PMDEP	153100	program-memory deposit
032	AMEMR	142474	physical (absolute) data-memory read
033	AMEMW	142545	physical (absolute) data-memory write
034	MPSTO	153146	micro stop
035	5MCLE	153247	master clear
036	MONSA	153356	(monitor save / undocumented)
037	CSLOA	153441	LOAD CONTROL STORE (microcode load - the emulator gate)
040	DEFMC	155742	define memory configuration
041	RSTAT	156064	read ND-500 interface status
042	EXAM	150416	examine (log off + terminate)
043-045	ERRFP	141574	(not serviced here; ND-100-side reserve/special)
046	SWFDE	156207	define swap file
047	SWFDL	156535	delete swap file
050	TSTFU	156701	test function
051	RINTE	162604	read interface (IODATUT) register
052	G5PAG	162670	give ND-500 pages
053	T5PAG	163372	take ND-500 pages
054	RUNSW	163621	start (run) swapper
055	SPLAC	164137	start-place
056	EPLAC	164407	end-place
057	RMVER	164652	read micro-program version
060	LIMEM	164776	list memory configuration
061	MEMSP	165041	reserve memory (test-monitor)
062-066	ERRFP	141574	(histogram; ND-100-side)
067	SPRTE	165511	read process entry from name segment
070	GPRTE	165771	get process table entry
071	SSGTE	166110	read phys-segment entry from name segment
072	GSGTE	166352	get phys-segment table entry
073	RPHSG	166537	read from a physical segment
074	SPRNM	166645	set process name
075	ERRFP	141574	(user-SYSTEM check; ND-100-side)
076	TOSWP	166733	message to swapper
077	ERRFP	141574	(read message; ND-100-side)
100-101	ERRFP	141574	(flags; ND-100-side)
102	500SR	167127	stop ND-500 system
103	ERRFP	141574	(read system vars; ND-100-side)
104	WSYSP	167277	write system parameters
105	S1PRI	167325	set priority
106	LINKT	167523	link to process
107	ERRFP	141574	(undocumented)
110	WPHSG	167550	write into a physical segment
111-115	ERRFP	141574	(process logging; ND-100-side)
116	REL50	147727	log off own process (= release)
117	ERRFP	141574	(abort; ND-100-side)
120	SOUTF	167723	set output device
121	FSWPR	142576	read from swapper data memory
122	ERRFP	141574	(logout; ND-100-side)
123	MRELS	167730	release memory (test-monitor)
124-126	ERRFP	141574	(moncall logging; ND-100-side)
127	5DFSY	167736	define standard domain
130	5SFSY	171122	start standard domain
131	5DLSY	172015	delete standard domain
132	5LISY	172263	list standard domains
133	ERRFP	141574	(list exec-queue; ND-100-side)
134	PLDEB	172660	place debugger
135	ABLOG	147734	log off + abort RT-program
136	GPRMA	173217	activate stopped process
137	ERRFP	141574	(unused)
140	5SRES	173243	(reserve/special-place pair)
141	COMSB	173301	set block size of a file
142	SINPD	173370	redefine default infant file
143-144	ERRFP	141574	(activate / change-cpu; ND-100-side)
145	SISTD	173377	start standard domain from S3 opcom
146	ERRFP	141574	(illegal)
147	RELS3	147744	(escape while running std domain)
150-153	ERRFP	141574	(list-time-queue / illegal)
154	DBUGS	173536	debug swapper
155	STSEL	174061	(set select / free-for-patching)
156	READS	174106	read system info
157	MONAC	174261	write control store (alias 024) / monitor access
160	NSGLO	142753	load segment (new domain format)
161	5NDFS	167744	define standard domain (new format)
162	INITR	174526	init tracer
163	CLRTR	174562	clear trace
164	ARMTR	174576	arm tracer
165	DISAR	174612	disarm tracer
166	DUMPT	174626	dump trace memory
167	CLRAD	174654	clear trace address
170	GETCP	174676	read ND-500 CPU-type + micro version
171	SCACH	174723	set cache
172	RSCRR	174776	read HW scratch register file
173-176	ERRFP	141574	(set-cpu-status / illegal; ND-100-side)
177	SETCU	175051	(set CU / FUNCMAX boundary)

Why this matters for the emulator

FUNCS is the implementation list for the ND-500 side of MON 60B. The routines that touch the ND-500 hardware / 5MPM message live here: REGRE/REGWR (register access via the memory-mapped register block), PMREA/PMWRI/AMEMR/AMEMW (memory transfer), CSLOA (control-store load - the gate that hung the emulator), MPSTA/MPSTO/5MCLE (micro start/stop/master-clear), RSTAT (interface status - what the "control store loaded?" check reads). These are the concrete routines to carve for Phase 1 (5MPM handshake) and Phase 3 (bus interface / bring-up).

Next carve priority: CSLOA (037, control-store load), RSTAT (041, interface status), REGRE/REGWR (register access), MPSTA/MPSTO/5MCLE (micro control), and the LDATX/STATX 5MPM primitives at 143300B - these are the emulator's control-store gate + register/memory interface.