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The COM1 port is wired as an RS-232 interface to a PC compatible DB9
connector on the front panel and it is also routed to the transition module
via J3. COM2 is wired as an RS-232 interface and is routed to the J3 I/O
connector for transition module I/O.
For additional programming information, refer to the PCI and ISA bus
discussions in the MCP750 Single Board Computer Programmer's
Reference Guide, listed in
vendor documentation for the ISA Super I/O device.
Parallel Port/Printer Interface
The parallel port is a full IEEE1284 bi-directional parallel port/printer
interface that supports standard enhanced and extended port modes. All
parallel I/O interface signals are routed to the transition module that
includes series damping resistors.
Hardware initializes the parallel port as PPT1 with an ISA I/O base address
of $3BC. This default configuration also assigns the parallel port to
Peripheral Bus Controller (PBC) interrupt request line IRQ7. The default
configuration can be changed by reprogramming the ISA Super I/O
device. For additional programming information, refer to the PCI and ISA
bus discussions in the MCP750 Single Board Computer Programmer's
Reference Guide and to the vendor documentation for the ISA Super I/O
device.
Floppy Disk/Tape Drive Controller
The ISA Super I/O device incorporates a PS/2-compatible low- and high-
density disk drive controller for use with an optional external disk drive, or
a domain specific FLOPPY connector on the backplane. The drive
interfaces with the ISA Super I/O controller via the transition module.
The ISA Super I/O disk drive controller is compatible with the DP8473,
765A, and N82077 devices commonly used to implement floppy disk
controllers. Software written for those devices may be used without
change to operate the ISA Super I/O controller. The ISA Super I/O device
may be used to support any of the following devices:
❏
http://www.motorola.com/computer/literature
Appendix C, Related
3
1
-inch 1.44MB floppy disk drive
/
2
Block Diagram
Documentation, and to the
3
3-11
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