I actually find the intel manual on SIB bytes quite straightforward and useful. Section 2.1.5 and specifically tables 2-2 and 2-3 show really quite simply all p

I actually find the intel manual on SIB bytes quite straightforward and useful. Section 2.1.5 and specifically tables 2-2 and 2-3 show really quite simply all possible values of the ModRM byte and their operands [1]. It can be quite a good exercise to try and produce your own hex opcodes from the tables using something like CyberCheff [2]. [1] https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf#page=38 https://www.intel.com/content/dam/www/public/us/en/documents... [2] https://gchq.github.io/CyberChef/#recipe=Disassemble_x86('32','Full%20x86%20architecture',16,0,true,true)&input=OGIwMAo https://gchq.github.io/CyberChef/#recipe=Disassemble_x86('32...