problem in understanding mul & imul instructions of Assembly language

Question

I\'m learning 80386 from PC Assembly by paul caurter

  mul source

• If the operand is byte sized, it is multiplied by

Answer 1

A1: mul was originally present on the 8086/8088/80186/80286 processors, which didn't have the E** (E for extended, i.e. 32-bit) registers.

A2: See A1.

As my work as an assembly language programmer moved to the Motorola 680x0 family before those 32-bit Intels became commonplace, I'll stop there :-)