only. The DECserver 500 series server provided a convenient method to connect logically up to 128 Digital asynchronous terminals to one or more service nodes (hosts) on an Ethernet. The DECserver 500 series server also allowed for ULTRIX host-initiated connections to asynchronous printers. The DECserver 500 series server implemented the LAT protocol for communication with service nodes that implemented this protocol on the same Ethernet. The 500 series differed from other DECservers in that the configuration was not stored in nonvolatile storage locally on the server itself, but rather downline loaded from a file on a MOP host. Configuration changes which needed to remain permanently had to be changed locally on the DECserver and also updated on the MOP host using the OpenVMS Terminal Server Configurator utility (SYS$COMMON:[DECSERVER]DS5CFG on VMS or /usr/lib/dnet/tsc on Ultrix) so that it would return the next reboot. The 500 and 550 models are based on the PDP-11/53 chipset with 512kb or 1.5mb of on-board ram and can be reverted to a full PDP-11/53 system with a PROM swap and console port re-wire. Model Number: DSRVS-** Ports: up to 128 Alternate product: CXY08 = DECserver 708; CXA16 = DECserver 716, 732 DECserver 90L Nicknamed Plain Old Terminal Server (POTS), the DECserver 90L ran ROM-based firmware and supported LAT only. Its stripped-down functionality left out ‘dedicated service’ and ‘preferred service’ features. Model Number: DSRVD-** Ports: 8 MMJ; 1 BNC Alternate product: DECserver 90M+ DECserver 90L+ The DECserver 90L+ terminal server was an eight line terminal server that supported terminals and printers. Each line or port could establish up to a maximum of four LAT sessions and one MOP session at a time. DECserver 90L+ supported the LAT protocol and was designed to work in a ThinWire Ethernet Local Area Network (LAN), Model Number: DSRVG-** Ports: 8 MMJ; 1 BNC Alternate product: DECserver 90M+ DECserver 90TL Designed for asynchronous connections up to 57.6 kbit/s to UNIX, ULTRIX, VMS, DOS and multi-vendor network services. The DECserver 90TL supported TCP/IP protocols and several remote management systems. Model Number: DSRVE-** Ports: 8 RJ45; 1 BNC Alternate product: DECserver 90M+ DECserver 90M There were three iterations of the DECserver 90M: DSRVH-M*, -A*, configured without Flash RAM; the DSRVH-N*, -D*, configured with 1 MB of Flash RAM; DSRVH-P*, -R* configured with 2 MB of Flash RAM. All supported expanded multi-protocol connections via LAT, Telnet, SLIP, TN3270, CSLIP and PPP. Also supported were remote-node