2-76 Service Guide
The Bidirectional Parallel Port:
Enhanced Parallel Port(EPP) compatible
Extended Capabilities Port(ECP) compatible, including level 2 support
Bidirectional under either software or hardware control
Compatible with ISA, and EISA, architectures
Ability to multiplex FDC signals on parallel port pins allows use of an external Floppy
Disk Drive(FDD)
Includes protection circuit to prevent damage to the parallel port when a connected
printer is powered up or is operated at a higher voltage
The UARTs:
Software compatible with the PC16550A and PC16450
MIDI baud rate support
Infrared support on UART2(IrDA and Sharp-compliant)
The Address Decoder
6 bit or 10 bit decoding
External Chip Select capability when 10 bit decoding
Full relocation capability(No limitation)
Enhanced Power Management
Special configuration registers for power-down
Enhanced programmable power-down FDC command
Auto power-down and wake-up modes
2 special pins for power management
Typical current consumption during power-down is less than 10 uA
Reduced pin leakage current
Mixed Voltage support
Supports standard 5V operation
Supports 3.3V operation
Supports mixed internal 3.3V operation with 3.3V/5V external configuration
The General Purpose Pins:
2 pins, for 2 separate programmable chip select decoders, can be programmed for game
port control