PORT_WD93_COMMAND_STATUS:	EQU 080H
PORT_WD93_TRACK:			EQU 081H
PORT_WD93_SECTOR:			EQU 082H
PORT_WD93_DATA:				EQU 083H
PORT_FDD_STATUS:			EQU 085H

PORT_MEMORY0:				EQU 0
PORT_ZX128:					EQU 07FFDH
PORT_CPM:					EQU 80FDH
PORT_KBD:					EQU 0FEH
PORT_KBD_EXT:				EQU 7EH

PORT_PRN_DATA:				EQU 0FBH
PORT_PRN_STROBE:			EQU 7BH
PORT_PRN_READY:				EQU 1BH
