MASM uses the standard Intel syntax for writing x86 assembly code. The full x86 instruction set is large and complex (Intel's x86 instruction set manuals comprise over 2900 pages), and we do not cover it all in this guide. For example, there is a 16-bit subset of the x86 instruction set. Using the 16-bit programming model can be quite complex.

14/07/2016 · X86-assembly/Instructions - aldeid.

x86 instruction set Three main groups Data movement (from memory and between registers) Arithmetic operations (addition, subtraction, etc.) Control flow (jumps, function calls)

The instruction has no ModR/M byte; the offset of the operand is coded as a word or double word (depending on address size attribute) in the instruction. No base register, index register, or scaling factor can be applied (for example, MOV (A0–A3)). P: The reg field of the ModR/M byte selects a packed quadword MMX™ technology register. Q

28/02/2016 · Retrieved from " https://www.aldeid.com/w/index.php?title=X86-assembly/Instructions/cdq&oldid=31630 ". Category: Architecture/x86-assembly.

The syntax of x86 I think is different, you'd have to do probably IN 3f8h, ah or something similar, i.e. into a register first with the data coming in, then you'd MOV 800h, ah i.e. mov the data into the memory location in the RAM, (If you wanted to store it), or do something else with ah etc. ah is an example register, it could be any, al, bh, bl etc whatever, but check the syntax, every assembler …