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The 8087 math coprocessor

The 8087 math coprocessor. 8087 Data Types. 3 Types 1. Binary integer 2. Packed Decimal 3. Real. Binary Integers. Assembler Directive Word integer 16 bitsDW (Define Word) Short integer 32 bitsDD (Define DoubleWord ) Long Integer 64 bitsDQ (Define Quadword ).

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The 8087 math coprocessor

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  1. The 8087 math coprocessor

  2. 8087 Data Types • 3 Types 1. Binary integer 2. Packed Decimal 3. Real

  3. Binary Integers Assembler Directive • Word integer16 bitsDW(Define Word) • Short integer 32 bitsDD(Define DoubleWord) • Long Integer 64 bitsDQ(Define Quadword)

  4. Packed Decimal Numbers Assembler Directive Packed Decimal80 bitsDT(Define TenBytes)

  5. Real Numbers Assembler Directive • Short real32 bitsDD(Define DoubleWord) • Long Real 64 bitsDD(Define QuadWord) • Temporary Real 80 bitsDT(Define TenBytes)

  6. The 8087 Internal Architecture

  7. Control word format

  8. Status word format

  9. 8087 stack operation

  10. Pythagoras Theorem Data segment word public Side_add 3.0 Side_bdd 4.0 Result dd 0 Ctrl_worddw 0 Status_worddw 0 Data ends Code segment word puplic Assume cs: code, ds:data Start: movax,data movds,ax FINIT mov ctrl_word,03ffh FLDCW ctrl_word FLD side_a FMUL ST,ST(0) FLD side_b FMUL ST,ST(0) FADD St,ST(1) FSQRT FSTSW status_word Movax,status_word AND al,0BFH JNZ stop FSTP result Stop: NOP Code ends End start

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