8-byte

In addition, the 87 floating point processor manipulates 8-byte quantities, which we call Q-words, and 10-byte quantities, which we call T-bytes.

DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 9 1990

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 1990

Full precision numbers are intended for storage of intermediate results (on the stack); they exist to insure maximum accuracy for calculations on double precision numbers, which is the official external format of 87 numbers. mem8r is an 8-byte memory quantity (typically declared with a DQ directive) containing a double precision floating point number.

DOCUMENTATION: A86 Assembler Package by Eric Isaacson Chapter 7 1990

To determine the memory use of these collections, I assumed 8-byte headers on normal objects, 12 - and 16-byte headers on arrays (see here),

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