>>78I think they're all different. That was 25 years ago. I learned enough digital design to hook microcontrollers like 8051 and 68000 with glue 74LS logic up to RAM, ROM, and devices. Now, they don't even have serial ports on PCs. USB is too complicated.
I stayed up-to-date with x86_64 assembly. I wrote a compiler and assembler. My generation all learned assembly. Today, it's rare, for good reason. It's very rare for my generation to know 64-bit, but I do.
Here's a quiz I made that has the gotchas of 64-bit x86.
http://www.templeos.org/Wb/Demo/Lectures/64BitAsmQuiz.html