ok, op codes, yes the little hex numbers that represent everything in asm. like when you put mov ax, 21 or add ax,2 those have a hex value that represents them. Where can i find those op codes for either 80x86 286, 386, 486 586 hell any intel chip? And also, to make like say a .bin file or a .com file, would one just have to write those hex values to a disk? like say the command for mov ax, 2 was 45af02 would i just write the ascii charicater for 45, then af then 02? so if anyone has a website or a file that talks about either of that please let me know thank you.