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(nasm.info)Section B.4.69

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B.4.69. `FBLD', `FBSTP': BCD Floating-Point Load and Store
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     FBLD mem80                    ; DF /4                [8086,FPU]
     FBSTP mem80                   ; DF /6                [8086,FPU]

   `FBLD' loads an 80-bit (ten-byte) packed binary-coded decimal number
from the given memory address, converts it to a real, and pushes it on
the register stack. `FBSTP' stores the value of `ST0', in packed BCD,
at the given address and then pops the register stack.