Router#show version
Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(3i), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 28-Nov-07 21:09 by stshen

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

Router uptime is 49 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-ipbase-mz.124-3i.bin"

Cisco 2811 (revision 53.51) with 251904K/10240K bytes of memory.
Processor board ID FHK1152F1QF
2 FastEthernet interfaces
1 Channelized E1/PRI port
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2142