doubleword

• “Non-integer constant doubleword, quadwords, and ten-byte numbers can be loaded via FLD.”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 7

• “In the interrupt handlers to memory-resident programs, the "normal" handler is often invoked via an indirect CALL or JMP instruction that fetches the doubleword address of the normal handler from memory, where it was stored by the initialization code.”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 12

• “The operand should be a doubleword memory quantity; but A86 will accept a word memory variable or a memory variable of unspecified size.”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 14

• “B or BYTE: byte-sized memory variable W or WORD: word (2 byte) sized memory variable D or DWORD: doubleword (4-byte) sized memory variable Q or QWORD: quadword (8-byte) sized memory variable T or TWORD: 10-byte-sized memory variable NEAR: program label accessed within a segment FAR: program label accessed from outside this segment ABS: an absolute number (i.e., an immediate constant)”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 10

• “The DD directive is used to initialize 32-bit doubleword pointers to locations in arbitrary segments of the 86's memory space.”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 9

• “LDS BX, D [01000]; load DS: BX with the doubleword at loc.”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 8

• “C4/r LES rw, ed Load EA doubleword into ES and word register”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 6b

• “TYPE Operator Syntax: TYPE operand The TYPE operator returns 1 if the operand is a byte variable; 2 if the operand is a word variable; 4 if the operand is a doubleword variable; 8 if the operand is a quadword variable; 10 if the operand is a ten-byte variable; and the number of bytes allocated by the structure if the operand is a structure name”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 8

• “+ for an index memory quantity c for a constant i for an interrupt-equate s for a structure If there is a second letter, it is a size attribute: b for byte, w for word, f for far (or doubleword).”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 13

• “9A cd CALL cd Call far segment, immediate 4-byte address E8 cw CALL cw Call near, offset relative to next instruction FF/3 CALL ed Call far segment, address at EA doubleword FF/2 CALL ew Call near, offset absolute at EA word”

  DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 6b

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