Last updated on June 13th, 2020 at 08:31 pm
Fixed Port Addressing
Variable Port Addressing
Fixed port addressing is of 8-bit.
Variable port addressing is of 16-bit.
In this case, only the lower AX, that is, AL is used.
In this case, AX is used.
In personal computer we can not use fixed port addressing as all 16-bits must be used.
We use variable port addressing in personal computer.