Asynchronous Serial Ports; Parallel Port - Motorola MVME2700 Series Installation And Use Manual

Functional Description

Asynchronous Serial Ports

5

Parallel Port

5-10
Floppy disk drive support via drive/power connector J3
Keyboard and mouse interface via circular DIN connectors J5 and
J7
The two asynchronous ports provided by the ISASIO device employ TTL-
level signals that are buffered through EIA-232-D drivers and receivers
and routed to the P2 connector.
Hardware initializes the two serial ports as COM1 and COM2 with ISA
I/O base addresses of $3F8 and $2F8 respectively. This default
configuration also assigns COM1 to PIB (PCI/ISA Bridge Controller)
interrupt request line IRQ4 and COM2 to line IRQ3. To change the default
configuration, reprogram the ISASIO device. For detailed programming
information, refer to the PCI and ISA bus discussions in the MVME2600
Series Programmer's Reference Guide and to the vendor documentation
for the ISASIO device.
The parallel port is a Centronics printer interface in MVME712M-
compatible models, and a full IEEE1284 bidirectional parallel port in
MVME761-compatible models. Both versions are implemented with the
ISASIO device. All parallel I/O interface signals are routed to P2 through
series damping resistors.
Hardware initializes the parallel port as PPT1 with an ISA IO base address
of $3BC. This default configuration also assigns the parallel port to PIB
(PCI/ISA Bridge Controller) interrupt request line IRQ7. You can change
the default configuration by reprogramming the ISASIO device. For
detailed programming information, refer to the PCI and ISA bus
discussions in the MVME2600 Series Programmer's Reference Guide and
to the vendor documentation for the ISASIO device.
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