Owner's manual

134 Allegro DOS Owner’s Manual
I/O Port Mapping
Address Function
080 Diagnostics Port
2F0 - 2F3 System Control Registers
2F8 - 2FF COM2:
300 - 31F Internal - Do Not Use
3D0 - 3DF CGA Display
3E0 - 3E7 PC Card Controller
3F8 - 3FF COM1: