Bayer HealthCare RapidPoint 400 Series, Service Manual, Page: 109 / 458

Rev. C Electronic System Overview 109
Peripheral Interfaces
Serial Ports
The COM1 serial port is in a user-definable I/O address range. The default
is 3F8. The default is for COM1 serial port interrupts to be signaled using
IRQ4. Connection to COM1 is by a standard male DB-9 connector
mounted on the card bracket.
The COM2 serial port is in a user-definable I/O address range. The default
is 2F8. The default is for COM2 serial port interrupts to be signaled using
IRQ3. Connection to COM2 is through a standard header connector on the
board that is shared with the parallel port.
Both COM ports are 16C550-compatible and contain FIFOs.
Parallel Port
The parallel port is in a user-definable I/O address range (278, 3BC, or
378). Parallel port interrupts are signaled using IRQ7. Connection to this
port is through a header connector on the board that is shared with the
COM2 serial port.
Floppy Disk Controller
The floppy disk controller is PC compatible. It uses bus interrupt IRQ6 and
the 8-bit DMA channel that corresponds to DRQ2 and ~DACK2 on the
AT-bus. Connection to a floppy disk drive is through a standard 34-pin
ribbon-cable header, which is mounted on the board.