Question

In variable port addressing, the address of the I/O port is loaded into which 8086 register?

Answer 1

Answer:

Register DX as a 16-bit I/O address (variable addressing). The byte, p8 ... 8-bit port addresses used to access system board device, e.g. timer and keyboard. ... The I/O banks on the 8086 through the 80386SX are also set up like the memory.