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Ax51 User's Guide
Ax51 Introduction Assembling Programs 
Writing Assembly Programs Assembly Statements 
Controls Instructions Comments Symbols and Symbol Names Labels Using Operands and Expressions Special Assembler Symbols Immediate Data Memory Access DATA BIT IDATA EDATA XDATA CODE Program Addresses Expressions and Operators Numbers Characters Character Strings Location Counter Operators ( ) * + - / < <= <> == > >= AND BYTEx EQ GT GTE HIGH LOW LT LTE MBYTE MOD NE NOT OR SHL SHR WORDx XOR Class Operators Expressions Expression Classes Relocatable Expressions Simple Relocatable Expressions Extended Relocatable Expressions Expressions Example Control Statements Macro Processor Error Messages AppendixExtended Relocatable Expressions
The extended relocatable expressions have generally the same rules that apply to simple relocatable expressions. Segment and external symbols are allowed in extended relocatable expressions. Extended relocatable expressions may be used only in statements that generate code as operands; these are:
- As an operand to a data initialization directive (DB or DW)
- As an operand to a machine instruction
Examples for extended relocatable expressions
REL1 + ABS1 * 10 EXT1 ABS1 LOW (REL1 + ABS1) WORD2 (SEG1)
Invalid form of simple relocatable expressions
(SEG1 + ABS1) * 10 relocatable value may not be multiplied.
(EXT1 REL1) you can add/subtract only absolute quantities
LOW (REL1) + ABS1 LOW may be applied only to the
final relocatable expression
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