12.4-24 IOS on NPE-400, its run, with finger crossed.

7206-RT1#sh ver
Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 12.4(24)T5, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Fri 04-Mar-11 06:49 by prod_rel_team

ROM: System Bootstrap, Version 12.2(4r)B2, RELEASE SOFTWARE (fc2)
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(22)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)

7206-RT1 uptime is 20 hours, 35 minutes
System returned to ROM by reload at 15:24:50 HPT Sat Sep 8 2012
System restarted at 15:31:13 HPT Sat Sep 8 2012
System image file is "disk0:c7200-advipservicesk9-mz.124-24.T5.bin"
Last reload reason: Reload Command

1 FastEthernet interface

28 Serial interfaces

2 HSSI interfaces

125K bytes of NVRAM.

62720K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).

125440K bytes of ATA PCMCIA card at slot 1 (Sector size 512 bytes).

4096K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x2102