http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml
| Bit Number | Hex | Meaning |
| 00-03 | 0x0000-0x000F | Boots Field Parameters 0x0000 Stays at the system bootstrap prompt 0x0001 Boots system image on EPROM 0x0002-0x000F Specifies a default netboot filename |
| 06 | 0x0040 | Ignore NVRAM contents |
| 07 | 0x0080 | Disable boot messages |
| 08 | 0x0100 | Break disabled |
| 10 | 0x0400 | IP broadcast with all zeros |
| 5,11,12 | 0x0020, 0x0800, 0x1000 | Console line speed |
| 13 | 0x2000 | Boots default ROM software if network boot fails |
| 14 | 0x4000 | IP broadcasts do not have net numbers |
| 15 | 0x8000 | Enables diagnostic messages Ignores NVRAM contents |
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