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B. Reserved Symbols

The A251 assembler uses predefined or reserved symbols that may not be redefined in your program. Reserved symbol names include instruction mnemonics, directives, operators, and register names. The following lists the reserved symbol names that are found in all A251 Assembler variants:

  • A
  • AB
  • ACALL
  • ADD
  • ADDC
  • AJMP
  • AND
  • ANL
  • AR0
  • AR1
  • AR2
  • AR3
  • AR4
  • AR5
  • AR6
  • AR7
  • BIT
  • BITADDRESSABLE
  • BLOCK
  • BSEG
  • C
  • CALL
  • CJNE
  • CLR
  • CMP
  • CODE
  • CPL
  • CSEG
  • DA
  • DATA
  • DB
  • DBIT
  • DEC
  • DIV
  • DJNZ
  • DPTR
  • DS
  • DSEG
  • DW
  • ELSE
  • ELSEIF
  • END
  • ENDIF
  • ENDM
  • ENDP
  • EQ
  • EQU
  • EXITM
  • EXTRN
  • GE
  • GT
  • HIGH
  • IDATA
  • IF
  • INBLOCK
  • INC
  • INPAGE
  • INSEG
  • IRP
  • IRPC
  • ISEG
  • JB
  • JBC
  • JC
  • JE
  • JG
  • JLE
  • JMP
  • JNB
  • JNC
  • JNE
  • JNZ
  • JSG
  • JSGE
  • JSL
  • JSLE
  • JZ
  • LCALL
  • LE
  • LJMP
  • LOCAL
  • LOW
  • LT
  • MACRO
  • MOD
  • MOV
  • MOVC
  • MOVX
  • MUL
  • NAME
  • NE
  • NOP
  • NOT
  • NUL
  • NUMBER
  • OR
  • ORG
  • ORL
  • OVERLAYABLE
  • PAGE
  • PC
  • POP
  • PUBLIC
  • PUSH
  • R0
  • R1
  • R2v
  • R3
  • R4
  • R5
  • R6
  • R7
  • REPT
  • RET
  • RETIv
  • RL
  • RLC
  • RR
  • RRC
  • RSEG
  • SEG
  • SEGMENT
  • SET
  • SETB
  • SHL
  • SHR
  • SJMP
  • SUB
  • SUBB
  • SWAP
  • UNIT
  • USING
  • XCH
  • XCHD
  • XDATA
  • XOR
  • XRL
  • XSEG

The A251 assembler defines the following additional reserved symbols which comprise the additional instructions and registers of the 251 architecture.

  • AT
  • BYTE
  • BYTE0
  • BYTE1
  • BYTE2
  • BYTE3
  • CONST
  • DD
  • DR0
  • DR12
  • DR16
  • DR20
  • DR24
  • DR28
  • DR4
  • DR56
  • DR60
  • DR8
  • DSB
  • DSD
  • DSW
  • DWORD
  • EBIT
  • EBITADDRESSABLE
  • ECALL
  • ECODE
  • EDATA
  • EJMP
  • ERET
  • EVEN
  • EXTERN
  • FAR
  • HCONST
  • HDATA
  • LABEL
  • LIT
  • MOVH
  • MOVS
  • MOVZ
  • NCONST
  • NEAR
  • OFFS
  • PROC
  • R10
  • R11
  • R12
  • R13
  • R14
  • R15
  • R8
  • R9
  • SLL
  • SRA
  • SRL
  • TRAP
  • WORD
  • WORD0
  • WORD2
  • WR0
  • WR10
  • WR12
  • WR14
  • WR16
  • WR18
  • WR2
  • WR20
  • WR22
  • WR24
  • WR26
  • WR28
  • WR30
  • WR4
  • WR6
  • WR8
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