MON 60 (N500M) - ND-500 Monitor Function Reference

Monitor Call: 60B (octal) Name: N500M / ND500Function Purpose: Inter-subsystem communication for ND-500 control Source: ND-60.136.04A ND-500 Loader Monitor, Chapter 10

Introduction for Newcomers

What is MON 60?

If you're new to Norsk Data systems, here's what you need to know:

MON 60 is a SINTRAN III "monitor call" - essentially a system call that lets programs running on the ND-100 (the main 16-bit computer) control the ND-500 (a powerful 32-bit coprocessor).

Think of it like this:

The ND-500 is a fast computation engine, but it can't do anything by itself
The ND-100 is the "brain" that runs the operating system and handles all I/O
MON 60 is how the ND-100 tells the ND-500 what to do

Why Does This Exist?

The ND-500 was designed in the 1980s as an add-on to boost computing power. Rather than replacing the ND-100, Norsk Data made them work together:

┌─────────────────┐                    ┌─────────────────┐
│     ND-100      │   "Do this math"   │     ND-500      │
│  ─────────────  │ ──────────────────►│  ─────────────  │
│  Operating      │                    │  Fast 32-bit    │
│  System         │◄────────────────── │  computation    │
│  All I/O        │   "Here's result"  │  No I/O         │
└─────────────────┘                    └─────────────────┘

How is MON 60 Used?

When you run @ND-500-MONITOR at the SINTRAN prompt, you're using a program that internally uses MON 60 to:

Load programs into ND-500 memory
Start and stop ND-500 execution
Read/write ND-500 registers
Debug ND-500 programs

Technical Overview

MON 60 (N500M) is the primary interface between ND-100 programs and the ND-500 coprocessor. It provides 67 subfunctions (0B through 142B octal) for:

Register and memory access
Process management
Control store operations
Memory configuration
Performance monitoring (histograms)
Logging and debugging
Domain management

Architecture

The ND-500 Monitor runs entirely on the ND-100 in three parts:

+------------------------------------------------------------------+
|                         ND-100                                    |
+------------------------------------------------------------------+
|  PAGE TABLE 2 (User Space)                                        |
|  +--------------------------------------------------------------+ |
|  |  ND-500-MONITOR Subsystem                                    | |
|  |  - User interface and command parsing                        | |
|  |  - High-level operations                                     | |
|  +--------------------------------------------------------------+ |
|                              |                                    |
|                        MON 60 (N500M)                             |
|                        Function code + parameters                 |
|                              v                                    |
+------------------------------------------------------------------+
|  PAGE TABLE 0 (Kernel)                                            |
|  +--------------------------------------------------------------+ |
|  |  N500M Handler                                               | |
|  |  - Function dispatch (67 subfunctions)                       | |
|  |  - Process management                                        | |
|  |  - Memory allocation                                         | |
|  |  - 5MPM shared memory access                                 | |
|  +--------------------------------------------------------------+ |
|                              |                                    |
+------------------------------------------------------------------+
|  RESIDENT (Paging Off)                                            |
|  +--------------------------------------------------------------+ |
|  |  ND-500 Driver                                               | |
|  |  - 3022 interface control (IOX instructions)                 | |
|  |  - Level 12 interrupt handling                               | |
|  +--------------------------------------------------------------+ |
+------------------------------------------------------------------+
                               |
                          3022 / 5MPM
                               v
+------------------------------------------------------------------+
|                         ND-500                                    |
|  - Executes domains/programs                                      |
|  - No direct I/O capability                                       |
+------------------------------------------------------------------+

Parameter Passing Convention

MON 60 uses Fortran-style parameter passing:

A-register points to a parameter address list
First word is the 16-bit function code
Remaining words are function-specific parameters (32-bit words or arrays)
Skip return = successful completion
Direct return = error occurred (error code in A-register)

; MAC assembly example
        LDA    (PARAMS        ; A-register -> parameter list
        MON    60             ; Call N500M
        JMP    ERROR          ; Direct return = error
        ...                   ; Skip return = success

PARAMS, <function-code>       ; First word: function code (16-bit)
        <param1>              ; Second word: first parameter
        <param2>              ; Third word: second parameter
        ...

Function Reference

Category 1: System Services (0B - 14B)

0B - RRREG (Read Register)

Purpose: Read a single ND-500 register

Parameter	Type	I/O	Description
reg.no	INT	I	Register number to read
value	INT4	O	Register value returned

1B - WRREG (Write Register)

Purpose: Write a single ND-500 register

Parameter	Type	I/O	Description
reg.no	INT	I	Register number to write
value	INT4	I	Value to write

2B - RPROG (Read Program Memory)

Purpose: Read from ND-500 program address space

Parameter	Type	I/O	Description
no.of bytes	INT4	I	Number of bytes to read
ND-500 addr	INT4	I	Source address in ND-500 program memory
data area	ARR	O	Buffer to receive data
bytes returned	INT4	O	Actual bytes read

3B - RDATA (Read Data Memory)

Purpose: Read from ND-500 data address space

Parameter	Type	I/O	Description
no.of bytes	INT4	I	Number of bytes to read
ND-500 addr	INT4	I	Source address in ND-500 data memory
data area	ARR	O	Buffer to receive data
bytes returned	INT4	O	Actual bytes read

4B - WPROG (Write Program Memory)

Purpose: Write to ND-500 program address space

Parameter	Type	I/O	Description
no.of bytes	INT4	I	Number of bytes to write
ND-500 addr	INT4	I	Destination address in program memory
data area	ARR	I	Data to write

5B - WDATA (Write Data Memory)

Purpose: Write to ND-500 data address space

Parameter	Type	I/O	Description
no.of bytes	INT4	I	Number of bytes to write
ND-500 addr	INT4	I	Destination address in data memory
data area	ARR	I	Data to write

6B - PLACE (Place Segment)

Purpose: Load a segment file into ND-500 memory

Parameter	Type	I/O	Description
file name	STRING	I	Segment file to load
segment base	INT4	I	Base address for segment
size in bytes	INT4	I	Size of segment
segment type	INT	I	Type code (program/data)

7B - SWLOD (Load Swapper)

Purpose: Load the swapper segment

Parameter	Type	I/O	Description
swapper segment name	STRING	I	Name of swapper segment file

Notes: The swapper is actually an ND-100 RT program, not ND-500 code.

10B - RRREG_BLOCK (Read Registers Block)

Purpose: Read multiple ND-500 registers as a block

Parameter	Type	I/O	Description
register block	ARR	O	Array to receive register values

11B - WRREG_BLOCK (Write Registers Block)

Purpose: Write multiple ND-500 registers as a block

Parameter	Type	I/O	Description
register block	ARR	I	Array of register values to write

12B - RUNN (Start Program)

Purpose: Start execution of an ND-500 domain/program

Parameter	Type	I/O	Description
stop reason	INT4	O	Reason execution stopped (see below)
returned trap info	INT4	O	Trap information if applicable
clear time used	INT	I	Flag to clear time accounting

Stop Reason Values:

65 (101B) - Normal completion via MON 407B (TPSTRA)
Other values indicate traps or errors

Notes: Seven parameters are transferred back to ND-100 on return.

13B - CNCFI (Connect File)

Purpose: Connect a file for ND-500 process use

Parameter	Type	I/O	Description
file name	STRING	I	File to connect
access code	INT	I	Access mode (read/write/etc.)
default type	INT	I	Default file type
connect no.	INT	I	Requested connection number (0 = any)
returned connect no.	INT	O	Actual connection number assigned

14B - CLSFI (Close File)

Purpose: Close a connected file

Parameter	Type	I/O	Description
file no.	INT	I	Connection number to close

Category 2: Process Management (15B - 37B)

15B - RESRV (Reserve ND-500 Process)

Purpose: Allocate an ND-500 process from an ND-100 RT program

Parameter	Type	I/O	Description
start addr. after escape	INT4	I	Restart address if user escapes
version string of PTO	STRING	I	Page Table Owner version string

Notes:

Creates a process that will be terminated via RELIS (16B)
Requires detailed knowledge of monitor operation
Used by RT programs that manage ND-500 processes

Example (MAC):

        LDA    (RESRVP
        MON    60
        JMP    ERROR
        ; Process reserved successfully

RESRVP, 15                    ; Function code RESRV
        STADDR                ; Start address after escape
        VERSTR                ; Version string

16B - RELIS (Release ND-500 Process)

Purpose: Release a previously reserved ND-500 process

Parameter	Type	I/O	Description
(none)	-	-	-

Notes: Releases all resources associated with the process reserved by RESRV.

17B - LISOP (List Open Files)

Purpose: List all files currently open by the ND-500 process

Parameter	Type	I/O	Description
(none)	-	-	Output goes to terminal

20B - TIMUS (Time Used)

Purpose: Get CPU time used by current process

Parameter	Type	I/O	Description
(none)	-	-	Time returned in standard format

21B - WHO (Who Is On)

Purpose: List active ND-500 processes

Parameter	Type	I/O	Description
(none)	-	-	Output goes to terminal

22B - ERRFL (Set Error Flag)

Purpose: Set the error flag value

Parameter	Type	I/O	Description
value	INT	I	Error flag value

23B - REACS (Read Control Store)

Purpose: Read from ND-500 control store (microcode memory)

Parameter	Type	I/O	Description
CS addr.	INT4	I	Control store address
no of 16 bit words	INT	I	Number of words to read
data-area	ARR	O	Buffer to receive data

Notes: Control store is 144 bits wide, transferred as 16-bit words.

24B - WRICS (Write Control Store)

Purpose: Write to ND-500 control store

Parameter	Type	I/O	Description
CS addr.	INT4	I	Control store address
no of 16 bit words	INT	I	Number of words to write
data-area	ARR	I	Data to write

Notes: Used for microcode patching or custom microprogram loading.

25B - MICST (Start Microprogram)

Purpose: Start microprogram execution at specified address

Parameter	Type	I/O	Description
micro program start address	INT4	I	Control store address to begin execution

26B - DMEXAM (Data Memory Examine)

Purpose: Examine (read) single data memory location

Parameter	Type	I/O	Description
addr.	INT4	I	Address to examine
value	INT4	O	Value at address

27B - DMDEP (Data Memory Deposit)

Purpose: Deposit (write) to single data memory location

Parameter	Type	I/O	Description
addr.	INT4	I	Address to modify
value	INT4	I	Value to deposit

30B - PMEXAM (Program Memory Examine)

Purpose: Examine single program memory location

Parameter	Type	I/O	Description
addr.	INT4	I	Address to examine
value	INT4	O	Value at address

31B - PMDEP (Program Memory Deposit)

Purpose: Deposit to single program memory location

Parameter	Type	I/O	Description
addr.	INT4	I	Address to modify
value	INT4	I	Value to deposit

32B - ABSMR (Absolute Memory Read)

Purpose: Read from absolute physical memory

Parameter	Type	I/O	Description
no. of bytes	INT4	I	Number of bytes to read
ND-500 addr.	INT4	I	Physical address
data area	ARR	O	Buffer to receive data
bytes returned	INT4	O	Actual bytes read

Notes: Bypasses memory management - direct physical access.

33B - ABSMW (Absolute Memory Write)

Purpose: Write to absolute physical memory

Parameter	Type	I/O	Description
no. of bytes	INT4	I	Number of bytes to write
ND-500 addr.	INT4	I	Physical address
data area	ARR	I	Data to write

34B - MSTOP (Stop Microprogram)

Purpose: Stop microprogram execution

Parameter	Type	I/O	Description
(none)	-	-	-

35B - MSTCL (Master Clear)

Purpose: Master clear the ND-500

Parameter	Type	I/O	Description
(none)	-	-	-

Notes: Resets the ND-500 hardware via 3022 interface MCLR5 command.

37B - LDCS (Load Control Store)

Purpose: Load control store from file

Parameter	Type	I/O	Description
CS addr	INT4	I	Starting address in control store
no of words	INT4	I	Number of words to load
file name	STRING	I	Microcode file (typically CONTROL-STORE:DATA)

Category 3: Memory Management (40B - 61B)

40B - DEFM (Define Memory Configuration)

Purpose: Define ND-500 memory configuration

Parameter	Type	I/O	Description
start page	INT4	I	First page number
no. of memory parts	INT	I	Number of memory regions
part array	ARR	I	Array describing each memory region

41B - RSTAT (Read Communication Status)

Purpose: Read 3022/5015 interface status

Parameter	Type	I/O	Description
status	INT4	O	Status bits (16:31=ND-500, 0:15=ND-100)
MAR	INT4	O	Memory Address Register value

Status Bits (ND-100 side, bits 0:15):

Bit 5: Interface locked
Bit 6: DMA error
Bit 7: Power fail
Bit 8: Power was off
Bit 9: Clock stopped

43B - SPRES (Reserve for Special Use)

Purpose: Reserve ND-500 for exclusive/special use

Parameter	Type	I/O	Description
(none)	-	-	-

44B - SPREL (Release After Special Use)

Purpose: Release ND-500 from exclusive use

Parameter	Type	I/O	Description
(none)	-	-	-

45B - DEFSW (Define Swap File)

Purpose: Define a swap file for paging

Parameter	Type	I/O	Description
file name	STRING	I	Swap file name

47B - DELSW (Delete Swap File)

Purpose: Delete a swap file

Parameter	Type	I/O	Description
file name	STRING	I	Swap file to delete

50B - TESTF (Test Function)

Purpose: Internal test function

Parameter	Type	I/O	Description
I1	INT4	I	Test parameter 1
I2	INT4	I	Test parameter 2
I3	INT4	I	Test parameter 3
I4	INT4	I	Test parameter 4

51B - RIFRG (Read Interface Register)

Purpose: Read 3022 interface register

Parameter	Type	I/O	Description
register value	INT4	O	Interface register value

52B - G500P (Give ND-500 Pages)

Purpose: Allocate memory pages to ND-500

Parameter	Type	I/O	Description
number of pages	INT4	I	Pages to allocate

53B - T500P (Take ND-500 Pages)

Purpose: Reclaim memory pages from ND-500

Parameter	Type	I/O	Description
number of pages	INT4	I	Pages to reclaim

54B - STSWP (Start Swapper)

Purpose: Start the swapper RT program

Parameter	Type	I/O	Description
(none)	-	-	-

55B - SPLAC (Start Place)

Purpose: Start segment placement operation

Parameter	Type	I/O	Description
(none)	-	-	-

56B - EPLAC (End Place)

Purpose: End segment placement operation

Parameter	Type	I/O	Description
(none)	-	-	-

57B - MPVER (Microprogram Version)

Purpose: Get microprogram version number

Parameter	Type	I/O	Description
version number	INT4	O	Microprogram version

60B - LIMEM (List Memory Configuration)

Purpose: Get current memory configuration

Parameter	Type	I/O	Description
array	ARR	O	Memory configuration data

61B - RESER (Reserve ND-500 and Memory)

Purpose: Reserve ND-500 with specified memory

Parameter	Type	I/O	Description
no. of pages	INT4	I	Number of pages to reserve
first page no.	INT4	O	First allocated page number

Notes: Use RELMEM (123B) to release.

Category 4: Histogram & Logging (62B - 72B)

62B - HIDEF (Define Histogram)

Purpose: Define a performance histogram

Parameter	Type	I/O	Description
start address	INT4	I	Start of address range to monitor
interval size	INT4	I	Size of each histogram bucket
no. of intervals	INT	I	Number of histogram buckets

63B - HISTA (Start Histogram)

Purpose: Start histogram collection

Parameter	Type	I/O	Description
(none)	-	-	-

64B - HISTP (Stop Histogram)

Purpose: Stop histogram collection

Parameter	Type	I/O	Description
(none)	-	-	-

65B - HISTN (Read Histogram)

Purpose: Read collected histogram data

Parameter	Type	I/O	Description
array	ARR	O	Histogram data

66B - HIREL (Release Histogram)

Purpose: Release histogram resources

Parameter	Type	I/O	Description
(none)	-	-	-

67B - SPRTE (Search for Process Entry)

Purpose: Search for a process by name

Parameter	Type	I/O	Description
process name	STRING	I	Name to search for
record	ARR	O	Process entry data

70B - GPRTE (Get Process Entry)

Purpose: Get process entry by number

Parameter	Type	I/O	Description
process	INT	I	Process number
record	ARR	O	Process entry data

71B - SSGTE (Search for Physical Segment)

Purpose: Search for a physical segment by name

Parameter	Type	I/O	Description
name of phys. segment	STRING	I	Segment name
array	ARR	O	Segment data

72B - GSGTE (Get Physical Segment)

Purpose: Get physical segment by number

Parameter	Type	I/O	Description
phys. segment no.	INT	I	Segment number
array	ARR	O	Segment data

Category 5: Process Control (73B - 110B)

73B - RPHSG (Read Physical Segment)

Purpose: Read data from a physical segment

Parameter	Type	I/O	Description
phys.segment no.	INT	I	Segment number
address	INT4	I	Offset within segment
no. of bytes	INT4	I	Bytes to read
array	ARR	O	Data buffer

74B - SPRNM (Set Process Name)

Purpose: Set the current process name

Parameter	Type	I/O	Description
process name	STRING	I	New process name

75B - USYST (User SYSTEM Test)

Purpose: Test if user is SYSTEM

Parameter	Type	I/O	Description
(none)	-	-	Skip return if SYSTEM

76B - TOSWP (Send Message to Swapper)

Purpose: Send a message to the swapper RT program

Parameter	Type	I/O	Description
record	ARR	I	Message record

77B - RPROC (Read Last Message)

Purpose: Read last message for a process

Parameter	Type	I/O	Description
process no.	INT	I	Process number
record	ARR	O	Message record

100B - RFLAG (Read Process Flag)

Purpose: Read 32-bit process communication flag

Parameter	Type	I/O	Description
process no.	INT	I	Process number
flag	INT4	O	32-bit flag value

Notes: Equivalent to SINTRAN MON 402B (Read input flag) for ND-500 processes.

Example (MAC):

        LDA    (RFLAGP
        MON    60
        JMP    ERROR
        ; Flag value now at FLAGVAL

RFLAGP, 100                   ; Function code RFLAG
        PROCNO                ; Process number
FLAGVAL,0                     ; 32-bit flag returned here
        0                     ; (high word)

101B - SPFLAG (Set Process Flag)

Purpose: Set 32-bit process communication flag

Parameter	Type	I/O	Description
process no.	INT	I	Process number
flag	INT4	I	32-bit flag value to set

Notes: Equivalent to SINTRAN MON 403B (Write output flag) for ND-500 processes. Also known as SFLAG in some documentation.

102B - GPSGE (Release ND-500 System)

Purpose: Release ND-500 system resources

Parameter	Type	I/O	Description
(none)	-	-	-

103B - RSYSP (Read System Parameters)

Purpose: Read system parameter array

Parameter	Type	I/O	Description
parameter array	ARR	O	System parameters

104B - WSYSP (Write System Parameters)

Purpose: Write system parameter array

Parameter	Type	I/O	Description
parameter array	ARR	I	System parameters

105B - SPRIO (Set Priority)

Purpose: Set process priority and CPU limits

Parameter	Type	I/O	Description
ND-100 mon call priority	INT	I	Priority for ND-100 monitor calls
max percent CPU time	INT	I	Maximum CPU percentage allowed

106B - LNKPR (Link to Process)

Purpose: Link current process to another

Parameter	Type	I/O	Description
process no.	INT	I	Process to link to

110B - WPHSG (Write Physical Segment)

Purpose: Write data to a physical segment

Parameter	Type	I/O	Description
segm no.	INT	I	Segment number
ND-500 address	INT4	I	Offset within segment
no. of bytes	INT4	I	Bytes to write
data area	ARR	I	Data to write

Category 6: Process Logging (111B - 126B)

111B - SLOG1 (Start Process Log One)

Purpose: Start logging for one process

Parameter	Type	I/O	Description
process no.	INT	I	Process to log

112B - STOPLOG (Stop Logging)

Purpose: Stop process logging

Parameter	Type	I/O	Description
(none)	-	-	-

113B - RLOG (Read Log Info)

Purpose: Read logged information

Parameter	Type	I/O	Description
data area	ARR	O	Log data

114B - RELLOG (Release Log Facility)

Purpose: Release logging resources

Parameter	Type	I/O	Description
(none)	-	-	-

115B - SLOGA (Start Log All)

Purpose: Start logging all active processes

Parameter	Type	I/O	Description
(none)	-	-	-

117B - ABORT (Abort Process)

Purpose: Abort an ND-500 process

Parameter	Type	I/O	Description
process no.	INT	I	Process to abort

120B - SETOUT (Set Output Device)

Purpose: Set output device for process

Parameter	Type	I/O	Description
unit	INT	I	Device unit number

121B - RDSWP (Read from Swapper)

Purpose: Read data from swapper memory

Parameter	Type	I/O	Description
no. of bytes	INT4	I	Bytes to read
ND-500 address	INT4	I	Source address
data area	ARR	O	Data buffer
bytes read	INT4	O	Actual bytes read

122B - LOGOUT (Logout Process)

Purpose: Log out an ND-500 process

Parameter	Type	I/O	Description
process no	INT	I	Process to log out

123B - RELMEM (Release Memory)

Purpose: Release memory reserved by RESER (61B)

Parameter	Type	I/O	Description
(none)	-	-	-

124B - SMONLOG (Start Moncall Log)

Purpose: Start monitor call logging

Parameter	Type	I/O	Description
(none)	-	-	-

125B - PMONLOG (Print Moncall Log)

Purpose: Print collected monitor call log

Parameter	Type	I/O	Description
array	ARR	O	Array of 1K 16-bit words

126B - XMONLOG (Stop/Release Moncall Log)

Purpose: Stop and release monitor call logging

Parameter	Type	I/O	Description
(none)	-	-	-

Category 7: Domain Management (127B - 142B)

127B - DEFDOM (Define Standard Domain)

Purpose: Define a standard domain configuration

Parameter	Type	I/O	Description
array	ARR	I	Domain definition

130B - PLADOM (Place Standard Domain)

Purpose: Place (load) a standard domain

Parameter	Type	I/O	Description
name	STRING	I	Domain name

131B - DELDOM (Delete Standard Domain)

Purpose: Delete a standard domain definition

Parameter	Type	I/O	Description
name	STRING	I	Domain name to delete

132B - LSTDOM (List Standard Domain)

Purpose: List defined standard domains

Parameter	Type	I/O	Description
(none)	-	-	Output to terminal

133B - LSTEXQ (List Execution Queue)

Purpose: List processes in execution queue

Parameter	Type	I/O	Description
(none)	-	-	Output to terminal

134B - PLADBG (Place Debugger)

Purpose: Place the ND-500 debugger

Parameter	Type	I/O	Description
(none)	-	-	-

135B - LOGABT (Logout and Abort)

Purpose: Log out process and abort corresponding RT-programs

Parameter	Type	I/O	Description
(none)	-	-	-

136B - ACTIV (Activate)

Purpose: Activate a stopped process

Parameter	Type	I/O	Description
(none)	-	-	-

137B - UNUSED

Purpose: Not used (reserved)

140B - SRESPL (Start Residual Place)

Purpose: Start residual placement operation

Parameter	Type	I/O	Description
(none)	-	-	-

141B - SETBLK (Set Block Size)

Purpose: Set block size of a file

Parameter	Type	I/O	Description
(parameters not documented)	-	-	-

142B - DEFINF (Redefine Default Infant File)

Purpose: Redefine the default infant file

Parameter	Type	I/O	Description
(parameters not documented)	-	-	-

Error Handling

Return Convention

Skip return: Function completed successfully
Direct return: Error occurred, error code in A-register

Common Error Codes

Code	Description
1	Illegal function code
2	ND-500 not present
3	ND-500 not available
4	Process not reserved
5	Invalid parameter
6	Memory allocation failed
7	File not found
8	Access denied

Error Message Example

"Illegal Function Code in MON 60" - verify function code is in range 0B-142B.

Programming Examples

MAC Assembly - Reserve and Release Process

; Reserve an ND-500 process
        LDA    (RESRVP
        MON    60
        JMP    RESERR         ; Error reserving
        ; Process reserved successfully

        ; ... do work with ND-500 ...

; Release the process
        LDA    (RELISP
        MON    60
        JMP    RELERR         ; Error releasing
        ; Process released
        JMP    DONE

RESRVP, 15                    ; Function RESRV
        0                     ; Start address after escape
        VERSTR                ; Version string pointer

RELISP, 16                    ; Function RELIS (no parameters)

VERSTR, 'PTO V1.0           ' ; 16-character version string

RESERR, ...                   ; Handle reservation error
RELERR, ...                   ; Handle release error
DONE,   ...

MAC Assembly - Read/Write Process Flags

; Read flag from process 3
        LDA    (RFLAGP
        MON    60
        JMP    FLGERR
        ; Flag value now at FLAGVAL

; Set flag for process 3
        LDA    (SFLAGP
        MON    60
        JMP    FLGERR
        JMP    DONE

RFLAGP, 100                   ; Function RFLAG
        3                     ; Process number
FLAGVAL,0                     ; Flag value (low word)
        0                     ; Flag value (high word)

SFLAGP, 101                   ; Function SPFLAG
        3                     ; Process number
        177777                ; New flag value (low word)
        177777                ; New flag value (high word)

FLGERR, ...                   ; Handle flag error
DONE,   ...

FORTRAN - Read Control Store

      INTEGER*2 FUNCCODE
      INTEGER*4 CSADDR, WORDS
      INTEGER*2 CSBUF(100)

C     Read 20 words from control store address 1000
      FUNCCODE = 23           ! Function 23B = REACS
      CSADDR = 1000
      WORDS = 20

      CALL MONITOR_CALL('N500M', FUNCCODE, CSADDR, WORDS, CSBUF)
      IF (ERRCODE .NE. 0) THEN
          WRITE(*,*) 'Error reading control store:', ERRCODE
          STOP
      ENDIF

C     CSBUF now contains control store data

PLANC - Start Domain Execution

INTEGER : FUNCCODE
INTEGER4 : STOPREASON, TRAPINFO
INTEGER : CLEARTIME

ON ROUTINEERROR DO
    IF ErrCode > 0 THEN
        % Handle error
    ENDON
ENDON

% Execute domain
FUNCCODE := 12B               % RUNN
CLEARTIME := 1                % Clear time accounting
Monitor_Call('N500M', FUNCCODE, STOPREASON, TRAPINFO, CLEARTIME)

% Check stop reason
IF STOPREASON = 65 THEN
    % Normal completion
ELSE
    % Abnormal termination
ENDIF

Revision History

Date	Version	Author	Changes
2025-02-05	1.0	Claude	Initial comprehensive documentation

Source: ND-60.136.04A ND-500 Loader Monitor, Chapter 10, pp. 192-195 Scanned by Jonny Oddene for Sintran Data

Document	Description
ND-60.136.04A ND-500 Loader Monitor	Official MON 60 reference (Chapter 10)
ND-860228-2-EN SINTRAN III Monitor Calls	Monitor calls reference manual
ND500-MONITOR-CALL-MECHANISM.md	Analysis of inter-processor calls
ND500-MONITOR-CALL-PARAMETER-PASSING.md	Parameter passing details
ND500-SWAPPER-ANALYSIS.md	Swapper operation details

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