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DECserver terminal servers must download their firmware from the network when they boot up and initialize. The filenames are specified in a network request from the terminal server at boot time to initiate a MOP download of the firmware. On Alpha, Itanium or VAX systems running the OpenVMS operating system, these files are located in a directory named SYS$SYSROOT:[MOM$SYSTEM] which has system logical names of MOM$SYSTEM and MOM$LOAD if DECnet has been started.
This page is a list of the files that various DECservers will request on boot.
| Terminal Server Model | Memory requirement | Firmware Filename |
| DECserver 90L+ | none | PROM-based; no firmware downloaded |
| DECserver 90TL | 1 MB | MNENG1.SYS |
| DECserver 90TL | 1 MB | MNENG2.SYS(Some descriptions say 4 MB is required) |
| DECserver 90M | 1 MB | MNENG2.SYS (Some descriptions say 4 MB is required) |
| DECserver 90M | 2 MB | MNENG3.SYS |
| DECserver 90M+ | 4 MB | MNENG4.SYS |
| DECserver 100 | PS0801ENG.SYS | |
| DECserver 200 | PR0801ENG.SYS | |
| DECserver 200 | DP0601ENG.SYS | |
| DECserver 300 | SH1601ENG.SYS | |
| DECserver 700 | 1 MB | WWENG1.SYS |
| DECserver 700 | > 2 MB | WWENG2.SYS |
| DECserver 900TM | WWENG2.SYS |