On a typical microprocessor, a distinct I/O address is used to refer to
the I/O data registers and a distinct address for the control and
status registers in an I/O controller for a given device. Such
registers are refered to as ports. In intel 8088, two I/O instruction
formats are used. In one format, the 8-bit opcode specifies an dI/O
operation; this is followed by an 8-bit port address. Other I/O opcodes
imply that the port address is in the 16-bit DX register. How many
ports can the 8088 address in each I/O addressing mode???
Thank you!
