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Cisco 819 Integrated Services Routers Software Configuration Guide
OL-18906-02
APPENDIX
C
ROM Monitor
The ROM monitor firmware runs when the router is powered up or reset. The firmware helps to initialize
the processor hardware and boot the operating system software. You can use the ROM monitor to
perform certain configuration tasks, such as recovering a lost password or downloading software over
the console port. If there is no Cisco
IOS software image loaded on the router, the ROM monitor runs
the router.
This appendix contains the following sections:
• Entering the ROM Monitor, page C-1
• ROM Monitor Commands, page C-2
• Command Descriptions, page C-3
• Disaster Recovery with TFTP Download, page C-3
• Configuration Register, page C-10
• Console Download, page C-12
• Debug Commands, page C-13
• Exiting the ROM Monitor, page C-14
Entering the ROM Monitor
To use the ROM monitor, you must be using a terminal or PC that is connected to the router over the
console port.
Perform these steps to configure the router to boot up in ROM monitor mode the next time it is rebooted.
Command Purpose
Step 1
enable Enters privileged EXEC mode.
Enter your password if prompted.
Step 2
configure terminal Enters global configuration mode.
Step 3
config-reg 0x0 Resets the configuration register.