System Firmware; Bios; Bios Console Services; Bios Setup - Rockwell Automation Allen-Bradley ControlLogix 1756-MVI Programming Reference Manual

1756-MVI Module Overview 1-5

System Firmware

The 1756-MVI module includes an embedded BIOS and a
DOS-compatible operating system stored in Flash ROM. An additional
896K bytes of Flash ROM is configured as a ROM disk for user
program storage.
The ROM disk is mapped as drive A:/. The MVI also supports an
optional Compact Flash. The Compact Flash is mapped as C:/ and
must be enabled in the BIOS setup (see figure 1.5).

BIOS

The BIOS initializes the module and configures its devices. It provides
a DOS-compatible interface for the console and ROM disk services.
The BIOS also provides a means to update the ROM disk image
containing the user programs.

BIOS Console Services

The BIOS supports a DOS-compatible system console by redirecting
the BIOS video and keyboard services (INT10 and INT16) to serial
port PRT1. Special functions, such as cursor positioning, are translated
into ANSI escape sequences.
If the console is disabled in BIOS setup and the Setup Jumper is not
installed, then the video and keyboard redirection is not performed
and PRT1 is available for the user application.

BIOS Setup

The BIOS also allows the user to configure the module using the BIOS
Setup Menu. The Setup Menu provides module type and console port
(PRT1) configuration. The Setup Menu is invoked by typing Ctrl-C on
the console terminal connected to PRT1 when prompted during the
module boot process. The console terminal must be configured for
the ANSI or VT100 character sets in order to properly display the
Setup Menu.
Publication 1756-RM004B-EN-P - October 2000