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                    PSION ORGANISER II TECHNICAL MANUAL




            (c) Copyright Psion Ltd 1986.  All rights reserved.
            This  Technical Manual and the programs referred to
            therein are copyrighted works of Psion Ltd, London,
            England.    Reproduction   in  whole  or  in  part,
            including  utilization  in  machines   capable   of
            reproduction  or retrieval, without express written
            permission of Psion Ltd,  is  prohibited.   Reverse
            engineering is also prohibited.


            Psion  Ltd  makes  no   representation   that   the
            interconnections  of  its  products  in  the manner
            described herein will not infringe on  existing  or
            future  patent  rights,  nor  do  the  description
            contained herein imply the granting of  license  to
            make,   use,   or  sell  equipment  constructed  in
            accordance with these descriptions.

            The information in  this  document  is  subject  to
            change without notice.


                                   CONTENT



CHAPTER 1       INTRODUCTION


CHAPTER 2       SYSTEM BOARD

        2.1     GENERAL
        2.2     CIRCUIT DESCRIPTION
        2.3     MICROPROCESSOR
        2.3.1     OPERATING MODES
        2.3.2     MEMORY_MAP
        2.3.3     PORT 5
        2.3.4     PORTS 2 AND 6
        2.4     MEMORY DEVICES AND OPTIONS
        2.4.1     PROM
        2.4.2     RAM
        2.4.3     MEMORY DECODING AND LINKS
        2.4.4     OPTIONS FOR CM, XP AND LA
        2.5     MEMORY MAPPED I/O
        2.5.1     ADDRESS ASSIGNMENT
        2.5.2     PULSE SIGNAL
        2.5.3     ALARM SIGNAL
        2.5.4     NMI
        2.5.5     COUNTER
        2.5.6     SWITCH OFF
        2.6     CLOCK AND KEYBOARD
        2.6.1     DIVIDER CHAIN
        2.6.2     KEEPING TIME
        2.6.3     THE KEYBOARD
        2.7     LCD DISPLAY


CHAPTER 3       POWER SUPPLY BOARD

        3.1     GENERAL
        3.2     POWER SUPPLY REQUIREMENTS
        3.3     SUPPLY RAILS
        3.4     STANDBY REGULATOR
        3.5     VCC1/VCC2 REGULATOR
        3.6     SVCC REGULATOR
        3.7     V_LCD
        3.8     VOLTAGE PUMP
        3.9     SVPP REGULATOR
        3.10    REMOTE SWITCH ON
        3.11    BUZZER


CHAPTER 4       TOP SLOT BOARD

        4.1     GENERAL
        4.2     SLOT CONTROL BUS
        4.3     POWER RAILS
        4.4     DATA BUS (PROCESSOR PORT 2)
        4.5     CONTROL LINES (PROCESSOR PORT 6)
        4.6     AC_B INPUT


CHAPTER 5       OPERATING SYSTEM

        5.1     SYSTEM INTERFACE
        5.1.1     CALLING SYSTEM SERVICES
        5.1.2     REGISTER PRESERVATION
        5.1.3     ERROR HANDLING
        5.1.4     THE OS MACRO
        5.1.5     MEMORY USAGE
        5.1.6     SYSTEM CONSTANTS AND MACROS
        5.1.7     ERROR NUMBERS
        5.1.8     VECTOR NUMBERS
        5.2     SYSTEM VERSIONS
        5.2.1     CM/OS
        5.2.2     XP/OS AND XP2/OS
        5.2.3     LA/OS AND LA2/OS
        5.3     POWER UP
        5.3.1     COLD START
        5.3.2     WARM START
        5.4     POWER DOWN
        5.5     INTERRUPTS
        5.5.1     NON-MASKABLE INTERRUPTS
        5.5.2     TIMER 1 COMPARE INTERRUPT
        5.5.3     SOFTWARE INTERRUPT
        5.5.4     TRAP INTERRUPT
        5.6     VECTORS
        5.6.1     HARDWARE VECTORS
        5.6.2     SOFTWARE VECTORS
        5.7     RELEASE NOTES
        5.7.1     VERSION 2.3 AND EARLIER
        5.7.2     RELEASE 2.4
        5.7.3     RELEASE 2.6
        5.7.4     RELEASE 3.1
        5.8     SYSTEM SERVICES
        5.8.1     BT$NMDN
        5.8.2     BT$NMEN
        5.8.3     BT$NOF
        5.8.4     BT$NON
        5.8.5     BT$PPRG
        5.8.6     BT$SWOF


CHAPTER 6       MEMORY USAGE

        6.1     INTRODUCTION
        6.2     MEMORY MAP
        6.3     RAM MEMORY
        6.3.1     ZERO PAGE
        6.3.2     NON-ZERO PAGE
        6.4     NON-RAM MEMORY MAP
        6.4.1     INTERNAL REGISTERS
        6.4.2     MEMORY MAPPED I/O
        6.5     MEMORY USAGE
        6.5.1     OPERATING SYSTEM
        6.5.1.1     NAMING CONVENTION
        6.5.1.2     ZERO PAGE
        6.5.1.3     NON-ZERO PAGE
        6.5.1.4     BUFFERS
        6.5.1.5     TIMING
        6.5.1.6     I/O DRIVER SPACE
        6.5.1.7     COLD BOOT
        6.5.2     FREE MEMORY
        6.5.2.1     ALLOCATOR
        6.5.2.2     LANGUAGE
        6.5.2.3     PERMANENT MEMORY
        6.6     SYSTEM SERVICES
        6.6.1     AL$FREE
        6.6.2     AL$GRAB
        6.6.3     AL$GROW
        6.6.4     AL$REPL
        6.6.5     AL$SHNK
        6.6.6     AL$SIZE
        6.6.7     AL$ZERO


CHAPTER 7       KEYBOARD

        7.1     OPERATING THE KEYBOARD
        7.2     KEYBOARD SCANNING
        7.2.1     THE ON/CLEAR KEY
        7.2.2     THE KEY MATRIX
        7.2.3     KEY SCANNING
        7.3     KEYBOARD INTERRUPTS
        7.3.1     INITIALISING
        7.3.2     POLLING
        7.3.3     TRANSLATING
        7.3.4     BUFFERING
        7.3.5     KEY CLICK
        7.3.6     ALARM CHECKING
        7.3.7     FRAME-COUNTER
        7.3.8     DISPLAY TIMING
        7.4     TESTING FOR KEYS
        7.4.1     KEYTEST AND KEYGET
        7.4.2     PACK SWITCH OFF
        7.4.3     LOW BATTERY TEST
        7.4.4     MACHINE SWITCH OFF
        7.5     KEYBOARD VECTORS AND VARIABLES
        7.5.1     KBB_STAT
        7.5.2     BTA_POLL
        7.5.3     BTA_TRAN
        7.5.4     BTA_TABL
        7.5.5     KBB_SHFK
        7.5.6     KBB_CAPK
        7.5.7     KBB_NUMK
        7.5.8     KBW_TDEL
        7.5.9     KBB_DLAY
        7.5.10    KBB_REPT
        7.5.11    KBB_CLIK
        7.5.12    KBB_PKOF
        7.6     SYSTEM SERVICES
        7.6.1     KB$INIT
        7.6.2     KB$TEST
        7.6.3     KB$GETK
        7.6.4     KB$BREK
        7.6.5     KB$FLSH
        7.6.6     KB$UGET
        7.6.7     KB$STAT
        7.7     EXAMPLE
        7.7.1     FULL ASCII SET FROM KEYBOARD


CHAPTER 8       DISPLAY

        8.1     HARDWARE
        8.2     SOFTWARE
        8.2.1     EXAMPLE
        8.2.2     VARIABLE USAGE
        8.3     SYSTEM SERVICES
        8.3.1     DP$STAT
        8.3.2     DP$VIEW
        8.3.3     DP$PRNT
        8.3.4     DP$EMIT
        8.3.5     DP$SAVE
        8.3.6     DP$REST
        8.3.7     DP$WRDY


CHAPTER 9       DATAPACKS

        9.1     NAMING CONVENTIONS
        9.2     HARDWARE
        9.2.1     EPROM (Eraseable Programmable Read Only Memory)  9-2
        9.2.1.1     Reading from EPROM
        9.2.1.2     Writing to EPROM
        9.2.2     COUNTER
        9.2.2.1     Linearly Addressed Datapacks
        9.2.2.2     Page Counted Datapacks
        9.2.2.3     Segmented Datapacks
        9.2.3     RAMPACKS
        9.2.4     CONNECTOR
        9.2.5     8K AND 16K DATAPACKS
        9.2.6     32K DATAPACKS
        9.2.7     64K DATAPACKS
        9.2.8     128K DATAPACKS
        9.2.9     32k, 64k AND 128k RAMPACKS
        9.3     ORGANISER INTERFACE
        9.3.1     ORGANISER SIDE SLOT CONNECTOR
        9.3.2     PROCESSOR INTERFACE
        9.3.2.1     Block Diagram of the Processor Interface
        9.3.2.2     Powering up the Slots
        9.3.2.3     Selecting a Datapack Slot
        9.3.2.4     Reading from a Datapack Slot
        9.3.2.5     Hardware ID Byte
        9.3.2.6     Setting the Program Voltage (SVPP)
        9.3.2.7     Writing to a Datapack
        9.3.3     EXAMPLE
        9.4     SOFTWARE
        9.4.1     SUMMARY OF OPERATING SYSTEM SERVICES
        9.4.2     VARIABLE USAGE
        9.4.3     PACK ID STRING
        9.4.4     DEVICE A: INTERNAL RAM PACK
        9.5     SYSTEM SERVICES
        9.5.1     PK$SETP
        9.5.2     PK$SAVE
        9.5.3     PK$READ
        9.5.4     PK$RBYT
        9.5.5     PK$RWRD
        9.5.6     PK$SKIP
        9.5.7     PK$QADD
        9.5.8     PK$SADD
        9.5.9     PK$PKOF
        9.5.10    PACK ERRORS
        9.5.11    EXAMPLE


CHAPTER 10      SYSTEM TIMING

        10.1    REAL TIME CLOCK
        10.1.1    KEEPING TIME WITH NMI ON
        10.1.2    KEEPING TIME WITH NMI OFF
        10.1.3    AUTO-SWITCH-OFF TIME OUT
        10.2    KEYBOARD INTERRUPT TIMERS
        10.2.1    TMW_FRAM
        10.2.2    DPW_REDY
        10.3    SYSTEM SERVICES
        10.3.1    TM$DAYV
        10.3.2    TM$TGET
        10.3.3    TM$UPDT
        10.3.4    TM$WAIT


CHAPTER 11      EXTERNAL INTERFACING

        11.1    SOFTWARE INTERFACING
        11.1.1    BOOTABLE PACK DESCRIPTION
        11.1.1.1    DATAPACK_CONTROL_BYTE
        11.1.1.2    DATAPACK_SIZE_BYTE
        11.1.1.3    DEVICE_OR_CODE_BYTE
        11.1.1.4    DEVICE_NUMBER_BYTE
        11.1.1.5    DEVICE_VERSION_BYTE
        11.1.1.6    DEVICE_PRIORITY_BYTE
        11.1.1.7    DEVICE_CODE_ADDRESS_WORD
        11.1.2    RELOCATABLE OBJECT CODE DESCRIPTION
        11.1.3    DEVICE CODE DESCRIPTION
        11.1.4    DEVICE VECTORS
        11.1.4.1    VECTOR SERVICE 0 - INSTALL VECTOR
        11.1.4.2    VECTOR SERVICE 1 - REMOVE VECTOR
        11.1.4.3    VECTOR SERVICE 2 - LANGUAGE VECTOR
        11.1.5    BOOTING
        11.2    HARDWARE INTERFACES
        11.2.1    BUS SIGNALS
        11.2.1.1    SSS_B
        11.2.1.2    SOE_B
        11.2.1.3    SMR
        11.2.1.4    SCLK
        11.2.1.5    SVCC
        11.2.1.6    SGND
        11.2.1.7    SD0-SD7
        11.2.2    SIGNAL TRUTH TABLE
        11.2.2.1    STATE 0
        11.2.2.2    STATE 1
        11.2.2.3    STATE 2
        11.2.2.4    STATE 3
        11.2.2.5    STATE 4
        11.2.2.6    STATE 5
        11.2.3    EXAMPLE
        11.3    SYSTEM SERVICES
        11.3.1    DV$BOOT
        11.3.2    DV$LOAD
        11.3.3    DV$VECT
        11.3.4    DV$LKUP
        11.3.5    DV$CLER
        11.3.6    EXAMPLE


CHAPTER 12      FILING SYSTEM

        12.1         FILES AND RECORDS
        12.1.1    RECORDS
        12.1.1.1    SHORT RECORDS
        12.1.1.2    LONG RECORDS
        12.1.1.3    DELETED RECORDS
        12.1.2    FILES
        12.1.2.1    FIND, SAVE AND "MAIN"
        12.1.3    BLOCK FILES
        12.1.3.1    OPL PROCEDURES, SAVED DIARIES
        12.1.4    SUMMARY OF RECORD STRUCTURE
        12.1.5    ERROR HANDLING
        12.1.6    SUMMARY OF RECORD TYPES
        12.1.7    FILE SYSTEM VARIABLES
        12.1.8    ORGANISER I COMPATIBILITY
        12.2    SYSTEM SERVICES
        12.2.1    FL$BACK
        12.2.2    FL$BCAT
        12.2.3    FL$BDEL
        12.2.4    FL$BOPN
        12.2.5    FL$BSAV
        12.2.6    FL$CATL
        12.2.7    FL$COPY
        12.2.8    FL$CRET
        12.2.9    FL$DELN
        12.2.10   FL$ERAS
        12.2.11   FL$FFND
        12.2.12   FL$FIND
        12.2.13   FL$FREC
        12.2.14   FL$NEXT
        12.2.15   FL$OPEN
        12.2.16   FL$PARS
        12.2.17   FL$READ
        12.2.18   FL$RECT
        12.2.19   FL$RENM
        12.2.20   FL$RSET
        12.2.21   FL$SETP
        12.2.22   FL$SIZE
        12.2.23   FL$WRIT
        12.2.24   TL$CPYX


CHAPTER 13      UTILITIES

        13.1    BUFFER HANDLING SYSTEM SERVICES
        13.1.1    UT$CPYB
        13.1.2    UT$ICPB
        13.1.3    UT$FILL
        13.1.4    UT$ISBF
        13.1.5    UT$SPLT
        13.1.6    UT$UTOB
        13.1.7    UT$XTOB
        13.2    DISPLAY HANDLING SYSTEM SERVICES
        13.2.1    UT$DISP
        13.2.2    UT$DDSP
        13.3    INTEGER ARITHMETIC SYSTEM SERVICES
        13.3.1    UT$SDIV
        13.3.2    UT$SMUL
        13.3.3    UT$UDIV
        13.3.4    UT$UMUL
        13.4    MISCELLANEOUS SYSTEM SERVICES
        13.4.1    UT$ENTR
        13.4.2    UT$LEAV
        13.4.3    UT$XCAT
        13.4.4    UT$YSNO


CHAPTER 14      EDITOR

        14.1    LINE-EDITOR SYSTEM SERVICES
        14.1.1    ED$EPOS
        14.1.2    ED$EDIT
        14.1.3    ED$VIEW
        14.2    LANGUAGE EDITOR SYSTEM SERVICES
        14.3    LG$RLED
        14.4    LG$NEWP
        14.5    TL$XXMD


CHAPTER 15      MATHS FUNCTIONS

        15.1    FLOATING-POINT NUMBERS
        15.2    FLOATING-POINT ARITHMETIC
        15.2.1    MT$FADD
        15.2.2    MT$FSUB
        15.2.3    MT$FNGT
        15.2.4    MT$FMUL
        15.2.5    MT$FDIV
        15.3    CONVERTING NUMERIC TEXT TO FLOATING POINT
        15.3.1    MT$BTOF
        15.4    CONVERTING FLOATING-POINT TO TEXT STRING
        15.4.1    MT$FBDC
        15.4.2    MT$FBEX
        15.4.3    MT$FBIN
        15.4.4    MT$FBGN
        15.5    THE SCIENTIFIC FUNCTIONS
        15.5.1    FN$ATAN
        15.5.2    FN$COS
        15.5.3    FN$EXP
        15.5.4    FN$LN
        15.5.5    FN$LOG
        15.5.6    FN$POWR
        15.5.7    FN$RND
        15.5.8    FN$SIN
        15.5.9    FN$SQRT
        15.5.10   FN$TAN


CHAPTER 16      MENUS

        16.1    SYSTEM SERVICES
        16.1.1    MN$DISP
        16.2    TOP LEVEL MENU
        16.2.1    TL$ADDI
        16.2.2    TL$DELI


CHAPTER 17      LANGUAGE

        17.1    INTRODUCTION
        17.2    DEFINITIONS
        17.2.1    VARIABLES
        17.2.2    PROCEDURES
        17.2.3    PARAMETERS
        17.2.4    ADDRESSES
        17.2.5    INTEGERS
        17.2.6    FLOATING POINT
        17.2.7    STRINGS
        17.2.8    ARRAYS
        17.2.9    TYPE CONVERSION
        17.2.10   RECORDS AND FIELDS
        17.2.11   VARIABLE SCOPE
        17.2.12   EXTERNALS
        17.2.13   LANGUAGE POINTERS
        17.2.14   ADDRESSING MODES
        17.2.15   TOP LOOP
        17.3    OPERANDS
        17.4    OPERATORS
        17.4.1    ERRORS, CALLS AND PARAMETERS
        17.4.2    LOGICAL AND ARITHMETIC COMPARE OPERATORS
        17.5    COMMAND OPERATORS
        17.5.1    QCO_AT
        17.5.2    QCO_BEEP
        17.5.3    QCO_BREAK
        17.5.4    QCO_CLS
        17.5.5    QCO_CURSOR
        17.5.6    QCO_ESCAPE
        17.5.7    QCO_GOTO
        17.5.8    QCO_OFF
        17.5.9    QCO_ONERR
        17.5.10   QCO_PAUSE
        17.5.11   QCO_POKEB
        17.5.12   QCO_POKEW
        17.5.13   QCO_RAISE
        17.5.14   QCO_RANDOMIZE
        17.5.15   QCO_SPECIAL
        17.5.16   QCO_STOP
        17.5.17   QCO_TRAP
        17.6    FILE OPERATORS
        17.6.1    QCO_APPEND
        17.6.2    QCO_CLOSE
        17.6.3    QCO_COPY
        17.6.4    QCO_CREATE
        17.6.5    QCO_DELETE
        17.6.6    QCO_ERASE
        17.6.7    QCO_FIRST
        17.6.8    QCO_LAST
        17.6.9    QCO_NEXT
        17.6.10   QCO_BACK
        17.6.11   QCO_OPEN
        17.6.12   QCO_POSITION
        17.6.13   QCO_RENAME
        17.6.14   QCO_UPDATE
        17.6.15   QCO_USE
        17.7    OTHER OPERATORS
        17.7.1    QCO_KSTAT
        17.7.2    QCO_EDIT
        17.7.3    QCO_INPUT_INT
        17.7.4    QCO_INPUT_NUM
        17.7.5    QCO_INPUT_STR
        17.7.6    QCO_PRINT_INT
        17.7.7    QCO_PRINT_NUM
        17.7.8    QCO_PRINT_STR
        17.7.9    QCO_PRINT_SP
        17.7.10   QCO_PRINT_CR
        17.7.11   QCO_LPRINT_INT
        17.7.12   QCO_LPRINT_NUM
        17.7.13   QCO_LPRINT_STR
        17.7.14   QCO_LPRINT_SP
        17.7.15   QCO_LPRINT_CR
        17.7.16   QCO_RETURN
        17.7.17   QCO_RETURN_NOUGHT
        17.7.18   QCO_RETURN_ZERO
        17.7.19   QCO_RETURN_NULL
        17.7.20   QCO_PROC
        17.7.21   QCO_BRA_FALSE
        17.7.22   QCO_ASS_INT
        17.7.23   QCO_ASS_NUM
        17.7.24   QCO_ASS_STR
        17.7.25   QCO_DROP_BYTE
        17.7.26   QCO_DROP_WORD
        17.7.27   QCO_DROP_NUM
        17.7.28   QCO_DROP_STR
        17.7.29   QCO_INT_TO_NUM
        17.7.30   QCO_NUM_TO_INT
        17.7.31   QCO_END_FIELDS
        17.7.32   QCO_RUN_ASSEM
        17.8    INTEGER FUNCTIONS
        17.8.1    RTF_ADDR
        17.8.2    RTF_ASC
        17.8.3    RTF_DAY
        17.8.4    RTF_DISP
        17.8.5    RTF_ERR
        17.8.6    RTF_FIND
        17.8.7    RTF_FREE
        17.8.8    RTF_GET
        17.8.9    RTF_HOUR
        17.8.10   RTF_IABS
        17.8.11   RTF_INT
        17.8.12   RTF_KEY
        17.8.13   RTF_LEN
        17.8.14   RTF_LOC
        17.8.15   RTF_MENU
        17.8.16   RTF_MINUTE
        17.8.17   RTF_MONTH
        17.8.18   RTF_PEEKB
        17.8.19   RTF_PEEKW
        17.8.20   RTF_RECSIZE
        17.8.21   RTF_SECOND
        17.8.22   RTF_IUSR
        17.8.23   RTF_SADDR
        17.8.24   RTF_VIEW
        17.8.25   RTF_YEAR
        17.8.26   RTF_COUNT
        17.8.27   RTF_EOF
        17.8.28   RTF_EXIST
        17.8.29   RTF_POS
        17.9    FLOATING POINT FUNCTIONS
        17.9.1    RTF_ABS
        17.9.2    RTF_ATAN
        17.9.3    RTF_COS
        17.9.4    RTF_DEG
        17.9.5    RTF_EXP
        17.9.6    RTF_FLT
        17.9.7    RTF_INTF
        17.9.8    RTF_LN
        17.9.9    RTF_LOG
        17.9.10   RTF_PI
        17.9.11   RTF_RAD
        17.9.12   RTF_RND
        17.9.13   RTF_SIN
        17.9.14   RTF_SQR
        17.9.15   RTF_TAN
        17.9.16   RTF_VAL
        17.9.17   RTF_SPACE
        17.10   STRING FUNCTIONS
        17.10.1   RTF_DIR
        17.10.2   RTF_CHR
        17.10.3   RTF_DATIM
        17.10.4   RTF_SERR
        17.10.5   RTF_FIX
        17.10.6   RTF_GEN
        17.10.7   RTF_SGET
        17.10.8   RTF_HEX
        17.10.9   RTF_SKEY
        17.10.10  RTF_LEFT
        17.10.11  RTF_LOWER
        17.10.12  RTF_MID
        17.10.13  RTF_NUM
        17.10.14  RTF_RIGHT
        17.10.15  RTF_REPT
        17.10.16  RTF_SCI
        17.10.17  RTF_UPPER
        17.10.18  RTF_SUSR
        17.11   FILES
        17.11.1   CREATING
        17.11.2   OPENING
        17.11.3   LOGICAL FILE NAMES
        17.11.4   USING FILES
        17.12   PROCEDURE CALLS
        17.12.1   STANDARD PROCEDURES
        17.12.2   LANGUAGE EXTENSIONS
        17.13   WRITING OPL
        17.13.1   COMPACT Q CODE
        17.13.2   COMPACT ON RUN TIME
        17.13.3   FAST CODE
        17.13.3.1   PROCEDURES
        17.13.3.2   FILES
        17.13.4   CODE STYLE
        17.14   TRANSLATOR
        17.15   SYSTEM SERVICES INTERFACE
        17.15.1   RM$RUNP
        17.15.2   LN$STRT
        17.16   MACHINE CODE INTERFACE
        17.17   EXCEPTION HANDLING
        17.17.1   ERROR HANDLING
        17.17.2   OUT OF MEMORY
        17.17.3   LOW BATTERY
        17.17.4   ON/CLEAR KEY
        17.17.5   WARNING
        17.18   INDEX OF OPERANDS
        17.19   INDEX OF OPERATORS
        17.20   INDEX OF FUNCTIONS
        17.21   EXAMPLES
        17.21.1   EXAMPLE 1
        17.21.2   EXAMPLE 2
        17.21.3   EXAMPLE 3
        17.21.4   EXAMPLE 4
        17.21.5   EXAMPLE 5


CHAPTER 18      TABLE INTERPRETER

        18.1    THE TABLE INTERPRETER
        18.2    TABLE REGISTERS
        18.3    THE PREDEFINED ACTIONS
        18.3.1    RETURN
        18.3.2    CALL
        18.3.3    IF
        18.3.4    IF_NOT
        18.3.5    CASE
        18.3.6    VECTOR
        18.3.7    GOTO
        18.3.8    BRANCH
        18.3.9    EQL
        18.3.10   NEQ
        18.3.11   ASSIGN
        18.3.12   ADD2
        18.3.13   SUB2
        18.3.14   PUSH
        18.3.15   CALL_MC
        18.3.16   POP
        18.3.17   JSR
        18.3.18   RANGE
        18.3.19   LOADB
        18.3.20   STOREB
        18.3.21   END
        18.4    SYSTEM SERVICES
        18.4.1    IT$GVAL
        18.4.2    IT$RADD
        18.4.3    IT$TADD
        18.4.4    IT$STRT
        18.5    VARIABLE USAGE


CHAPTER 19      DIARY

        19.1    DIARY FORMAT
        19.2    ALARM TABLE FORMAT
        19.3    ALARM CHECKING INTERRUPTS
        19.4    WAKING UP FOR AN ALARM


CHAPTER 20      BUZZER

        20.0.1    BZ$ALRM
        20.0.1.1    BZ$BELL
        20.0.1.1.1    BZ$TONE


CHAPTER 21      ERROR HANDLING

        21.0.1    ER$LKUP
        21.0.1.1    ER$MESS

INDEX