Specifications

Hardware Configuration
2–13
Connector Type Mating Connector
RIBBON 3M 3421-7600
DISCRETE WIRE MOLEX HOUSING 22-55-2202
PIN 16-02-0103
Table 2-8 J11 and J13 Mating Connector
2.6.5 Serial Console
Unique to Ampro is ROM BIOS support for using a serial console (keyboard and display) in place of
the conventional video controller, monitor, and keyboard. See Chapter 3 for an explanation of the
serial console option.
2.6.6 Serial Downloader
Also unique to Ampro is ROM BIOS support for downloading a program from a host computer via a
serial port. The program is then run as if it had been loaded from disk. See Chapter 3 for an
explanation of the serial download option.
2.7 MULTIMODE PARALLEL PORT (J15)
The Little Board/486i incorporates a multimode parallel port. This port supports four modes of
operation:
! Standard PC/AT printer port (output only)
! PS/2-compatible bi-directional parallel port (SPP)
! Enhanced Parallel Port (EPP)
! Extended Capabilities Port (ECP)
See “Multimode Parallel Port” in Chapter 3 for a description of the parallel ports modes.
This section lists the pinout of the parallel port connector and describes how to configure it for its I/O
port and interrupt assignments, and how to assign a DMA channel to the port when operating in ECP
mode. Refer to Chapter 3 for programming information, including how to use the port for bi-
directional I/O.
2.7.1 I/O Addresses
The parallel port functions are controlled by eight I/O ports and their associated register and control
functionality. By selecting the base I/O address, you can configure the parallel port as the primary
port (typically LPT1) or the secondary port (typically LPT2), or you may disable the port to free the
hardware resources for other peripherals.
Table 2-9 lists the parallel port addresses you can select. Use the SETUP function described in
Chapter 3 to select the parallel port I/O addresses.