In computer networking , DECserver initially referred to a highly successful family of asynchronous console server / terminal server / print server products introduced by Digital Equipment Corporation (DEC) and later referred to a class of UNIX-variant application and file server products based upon the MIPS processor. In February 1998, DEC sold its Network Products Business to Cabletron, which then spun out as its own company, Digital Networks (later known as Vnetek Communications), in September 2000.
69-782: DECservers were introduced in 1985. The first model was the DECserver 100. This and all subsequent DECserver models used the Local Area Transport (LAT) protocol which was/is also supported by many DEC operating systems including VMS , RSX-11 , RSTS/E and Ultrix (an implementation of UNIX ). All DECservers were designed to boot their operating systems across the network using DECnet MOP Maintenance Operations Protocol with later models supporting TCP/IP booting using bootp protocol. Later models also support booting from flash memory cards. Model Option Numbers, Description and History DECserver 100 The DECserver 100 Terminal Server
138-606: A 1.44 MB 3.5" floppy drive and IND$ FILE transfer. Several third-party manufacturers produced 3270 displays besides IBM. GTE manufactured the IS/7800 Video Display System, nominally compatible with IBM 3277 displays attached to a 3271 or 3272. An incompatibility with the RA buffer order broke the logon screen in VM/SE (SEPP). Harris manufactured the 8000 Series Terminal Systems, compatible with IBM 3277 displays attached to
207-421: A 17", amber monochrome plasma display unit announced March 8, 1983, capable of displaying in various modes, including four independent 3278 model 2 terminals, or a single 160×62 terminal; it also supports partitioning. The 3290 supports graphics through the use of programmed symbols . A 3290 application can divide its screen area up into as many as 16 separate explicit partitions (logical screens). The 3290
276-464: A 3271 or 3272. Harris later manufactured the 9100–9200 Information Processing Systems, which included Informer Computer Terminals manufactured a special version of their model 270 terminal that was compatible with IBM 3270 and its associated coax port to connect to a 3x74. Documentation for the following is available at AT&T introduced the Dataspeed 40 terminal/controller, compatible with
345-402: A 66 key version, with no programmed function (PF) keys , and a 78 key version with twelve. Both versions had two Program Attention (PA) keys. The data entry keyboard had five PF keys and two PA keys. The operator console keyboard had twelve PF keys and two PA keys. Later 3270s had an Attention key, a Cursor Select key, a System Request key, twenty-four PF keys and three PA keys. There
414-512: A built-in LAT client. If a computer communicating via LAT doesn't receive an acknowledgment within 80 milliseconds for a packet it transmitted, it resends that packet; this can clog a network. No data is sent if no data is offered and under heavy loads LAT limits the number of packets sent per second to twenty-four: twelve transmits and twelve receives. As more characters are sent, the packets get bigger but not more numerous. Above 80 milliseconds latency
483-448: 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
552-512: A full-screen text editor, a menu system, and a PANEL facility to create 3270 full-screen applications. The modified data tag is well suited to converting formatted, structured punched card input onto the 3270 display device. With the appropriate programming, any batch program that uses formatted, structured card input can be layered onto a 3270 terminal. IBM's OfficeVision office productivity software enjoyed great success with 3270 interaction because of its design understanding. And for many years
621-460: A high speed proprietary communications interface, using coaxial cable . IBM no longer manufactures 3270 terminals, but the IBM 3270 protocol is still commonly used via TN3270 clients, 3270 terminal emulation or web interfaces to access mainframe-based applications, which are sometimes referred to as green screen applications . The 3270 series was designed to connect with mainframe computers, often at
690-532: A network request from the terminal server at boot time, to initiate a MOP download of the firmware. On an Alpha, Itanium or VAX system 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. The DECserver device's hardware address must be specified in the DECnet node database in order for
759-426: A physical location on the screen that also determines the beginning and end of a field. There are also character attributes associated with individual screen locations. Using a technique known as read modified, a single transmission back to the mainframe can contain the changes from any number of formatted fields that have been modified, but without sending any unmodified fields or static data. This technique enhances
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#1732852523048828-504: A remote location, using the technology then available in the early 1970s. The main goal of the system was to maximize the number of terminals that could be used on a single mainframe. To do this, the 3270 was designed to minimize the amount of data transmitted, and minimize the frequency of interrupts to the mainframe. By ensuring the CPU is not interrupted at every keystroke, a 1970s-era IBM 3033 mainframe fitted with only 16 MB of main memory
897-511: A secondary size of 32x80, 4 and 4+ have a secondary size of 43x80 and 5 and 5+ have a secondary size of 27x132. An application can override the primary and alternate screen sizes for the extended mode. The 3180 also supported a single explicit partition that could be reconfigured under application control. The IBM 3191 Display Station is an economical monochrome CRT. Models A and B are 1920 characters 12-inch CRTs. Models D, E and L are 1920 or 2560 character 14-inch CRTs. The IBM 3193 Display Station
966-500: A single box that provided the following: (2) Digital Parallel printer ports, each of which used a male 37-pin connector, (4) EIA RS-232-C/CCITT V.24 asynchronous line interfaces for connecting three serial printers and one serial printer or terminal, and (1) Ethernet interface transceiver port. The DECserver 250 implemented the Local Area Transport (LAT) protocol for communication with service nodes that implemented this protocol on
1035-465: A single connector (similar to Centronics printer connection). A special cable connects the DECserver to a "harmonica", with the same style of mass-connector, plus 8 MMJ jacks, positioned close to the terminals to be connected. Model Number: DSRVB-** Ports: 8 DB25 (/MC) or 8 MMJ (/DL) Alternate product: DECserver 708, 8 ports DB9, DSRVW-R* DECserver 250 The DECserver 250 was a network server for printers for Ethernet Local Area Networks, consisting of
1104-506: A touch typist will notice the sluggish character echo. The LAT 80 millisecond delay offloads both the network by sending fewer larger packets which also reduces interrupts at each system. Most Linux distributions offer a client and server lat package, that can easily be installed via a package manager . This allows e.g. to access a local area network server while being connected to a corporate VPN network that would otherwise block local TCP/IP traffic. IBM 3270 The IBM 3270
1173-591: Is a 32-port network access server that connects asynchronous devices, including terminals, printers, modems, or PCs to an Ethernet local area network (LAN). The DECserver 900TM is configured with 32 MJ8 (RJ-45) connectors, and provides limited modem control with the 8-pin connectors. Each port supports sixteen data rates from 75 bit/s to 115.2 kbit/s. The DECserver 900TM includes 4 MB of standard memory, and can be expanded to 8 MB. Model number: DSRVZ-** Ports: 32 RJ45 Alternate product: DECserver 732 DECserver 700-08 The original DECserver 700-08 (-A*, -B*)
1242-413: Is a Distributed Function Terminal (DFT) and requires that the controller do a downstream load (DSL) of microcode from floppy or hard disk. The 3180 was a monochrome display, introduced on March 20, 1984, that the user could configure for several different basic and extended display modes; all of the basic modes have a primary screen size of 24x80. Modes 2 and 2+ have a secondary size of 24x80, 3 and 3+ have
1311-553: Is a family of block oriented display and printer computer terminals introduced by IBM in 1971 and normally used to communicate with IBM mainframes . The 3270 was the successor to the IBM 2260 display terminal. Due to the text color on the original models, these terminals are informally known as green screen terminals. Unlike a character-oriented terminal , the 3270 minimizes the number of I/O interrupts required by transferring large blocks of data known as data streams , and uses
1380-428: Is a high-resolution, portrait-type, monochrome, 380mm (15 inch) CRT image display providing up to letter or A4 size document display capabilities in addition to alphanumeric data. Compressed images can be sent to the 3193 from a scanner and decompression is performed in the 3193. Image data compression is a technique to save transmission time and reduce storage requirements. The IBM 3194 is a Display Station that features
1449-632: Is an asynchronous network access server with eight on-board V.34 modems. Model Number: DSRVX-** Ports: 8 RJ45 Alternate product: None. DECserver 900GM/GMX The DECserver 900GM was a network access server that supported up to 16 full modem control ports, or 32 eight–wire partial modem control ports. The DECserver 900GMX was identical to the DECserver 900GM, except that it supported up to 8 full modem control ports, or 16 eight–wire partial modem control ports. The ports were used to connect asynchronous devices including terminals, printers, modems, or PCs to an Ethernet local area network (LAN). The DECserver 900GM
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#17328525230481518-463: Is factory installed. The Flash RAM is optional. The DECserver 708 can download the software image from the network or from the Flash RAM option if installed. The Flash RAM option allows for a boot/power up without having to download the image through the network. The DECserver 708 supports up to 4 MB of memory. Model number: DSRVW-R* Ports: 8 DB9 DECserver 716 This model was designed to replace
1587-425: Is sent with a bit rate of 2.3587 Mbit/s using a slightly modified differential Manchester encoding . Cable runs of up to 1,500 m (4,900 ft) are supported, although IBM documents routinely stated the maximum supported coax cable length was 2,000 ft (610 m). Originally devices were equipped with BNC connectors , which later was replaced with special so-called DPC – Dual Purpose Connectors supporting
1656-733: The PROFS calendar was the most commonly displayed screen on office terminals around the world. A version of the WordPerfect word processor ported to System/370 was designed for the 3270 architecture. 3270 devices can be a part of an SNA – System Network Architecture network or non-SNA network. If the controllers are SNA connected, they appear to SNA as PU – Physical Unit type 2.0 (PU2.1 for APPN) nodes typically with LU – Logical Unit type 1, 2, and 3 devices connected. Local, channel attached, controllers are controlled by VTAM – Virtual Telecommunications Access Method . Remote controllers are controlled by
1725-435: The channel of a nearby mainframe. A remote control unit is connected to a communications line by a modem . Remote 3270 controllers are frequently multi-dropped , with multiple control units on a line. IBM 3270 devices are connected to a 3299 multiplexer or to the cluster controller, e.g., 3271, 3272, 3274, 3174, using RG-62, 93 ohm, coax cables in a point to point configuration with one dedicated cable per terminal. Data
1794-485: The 3174 controller also enabled multiple sessions from a CUT type terminal. The 3278, along with the 3279 color display and the 3287 printer, introduced the Extended Display Stream (EDS) as the framework for new features. The IBM 3279 was IBM's first color terminal. IBM initially announced four models, and later added a fifth model for use as a processor console. The 3279 was introduced in 1979. The 3279
1863-1051: The 3270 and compatibles were by far the most commonly used terminals on IBM System/370 and successor systems. IBM and third-party software that included an interactive component took for granted the presence of 3270 terminals and provided a set of ISPF panels and supporting programs. Conversational Monitor System (CMS) in VM has support for the 3270 continuing to z/VM . Time Sharing Option (TSO) in OS/360 and successors has line mode command line support and also has facilities for full screen applications, e.g., ISPF . Device Independent Display Operator Console Support (DIDOCS) in Multiple Console Support (MCS) for OS/360 and successors supports 3270 devices and, in fact, MCS in current versions of MVS no longer supports line mode, 2250 and 2260 devices. The SPF and Program Development Facility (ISPF/PDF) editors for MVS and VM/SP (ISPF/PDF
1932-505: The 3270 data stream is forwarded to the display by the controller. The display interprets the 3270 protocol itself. In addition to passing the 3270 data stream directly to the terminal, allowing for features like EAB — Extended Attributes, Graphics, etc., DFT also enabled multi sessions (up to 5 simultaneous), featured in the 3290 and 3194 multisession displays. This feature was also widely used in 2nd generation 3270 terminal emulation software. The MLT — Multiple Logical Terminals feature of
2001-463: The 3270 data stream terminates. For CUT (Control Unit Terminal) displays, the stream terminates in the display controller, the controller instructs the display to move the cursor, position a character, etc. EBCDIC is translated by the controller into '3270 Character Set', and keyboard scan-codes from the terminal, read by the controller through a poll, is translated by the controller into EBCDIC. For DFT (Distributed Function Terminal) type displays, most of
2070-474: The 3275 and 3277 are the selector-pen , ASCII rather than EBCDIC character set, an audible alarm, and a keylock for the keyboard. A keyboard numeric lock was available and will lock the keyboard if the operator attempts to enter non-numeric data into a field defined as numeric. Later an Operator Identification Card Reader was added which could read information encoded on a magnetic stripe card . Generally, 3277 models allow only upper-case input, except for
2139-403: The 3rd party system was compatible with the 3270 data stream terminated in the unit, but not as 'Plug compatibility' equipment, also were compatible at the coax level thereby allowing IBM terminals to be connected to a 3rd party controller or vice versa. Modern applications are sometimes built upon legacy 3270 applications, using software utilities to capture ( screen scraping ) screens and transfer
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2208-519: The DECserver 700-16 and was introduced in 2000. It supports throughput rates of up to 115.0 kbit /s per port. A front panel slot provides support for a flash memory card. It offers RADIUS, Kerberos, RSA SecurID, PAP, CHAP, and CBCP or standard dial-back. Multiple Telnet sessions per port. Multiprotocol support: IP, LAT, and Appletalk. Telnet, LAT, TN3270, Rlogin, LPD and DNS. Dial up protocols: SLIP, CSLIP and PPP with AUTOLINK. Model number: DSRVW-J* Ports: 16 RJ45 DECserver 732 The DECserver 732 offers
2277-557: The DECserver 90M+ does not have a BNC connector. Speeds were increased to 230.4 kbit/s. Model number: DCSRV-** Ports: 8 RJ45 DECserver 708 This model was designed to replace the DECserver 700-08 and was introduced in 2003. It connects devices (such as printers, terminals, PCs, and modems) to local area networks (LANs). The DECserver 708 is Ethernet-based and supports 10BaseT Ethernet directly, and ThinWire Ethernet/IEEE 802.3 through an adapter. It supports Flash RAM capability and other nonvolatile forms of memory. The memory capability
2346-573: 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 and remote control applications as well as accounting event logging and audit trails. Model Number: DSRVH-** Ports: 8 RJ45; 1 BNC; 1 RJ45 LAN Alternate product: DECserver 90M+ DECserver 900MC The DECserver 900MC
2415-511: The IBM 3275, in 1980. IBM had two different implementations for supporting graphics. The first was implemented in the optional Programmed Symbol Sets (PSS) of the 3278, 3279 and 3287, which became a standard feature on the later 3279-S3G, a.k.a. 3279G, and was based on piecing together graphics with on-the-fly custom-defined symbols downloaded to the terminal. The second later implementation provided All Points Addressable (APA) graphics, a.k.a. Vector Graphics, allowing more efficient graphics than
2484-578: The IBM Shielded twisted pair cabling system without the need for so-called red baluns . In a data stream, both text and control (or formatting functions) are interspersed allowing an entire screen to be painted as a single output operation. The concept of formatting in these devices allows the screen to be divided into fields (clusters of contiguous character cells) for which numerous field attributes, e.g., color, highlighting, character set, protection from modification, can be set. A field attribute occupies
2553-460: The LAT protocol for communication with service nodes that implemented this protocol on the same Ethernet. The DECserver 300 also implemented the TCP/IP protocol suite for communication with host systems that implemented TCP/IP. Model Number: DSRVF-** Ports: 16 DB25 or MMJ Alternate product: DECserver 708, 8 ports DB9 or DECserver 716, 16 ports RJ45 DECserver 500/550 The DECserver 500 series server
2622-571: The LAT protocol. In 1984, the first implementation of the LAT protocol connected a terminal server to a VMS VAX-Cluster in Spit Brook Road, Nashua, NH. By "virtualizing" the terminal port at the host end, a very large number of plug-and-play VT100-class terminals could connect to each host computer system. Additionally, a single physical terminal could connect via multiple sessions to multiple hosts simultaneously. Future generations of terminal servers included both LAT and TELNET protocols, one of
2691-411: The Local Area Transport (LAT) protocol for communication with service nodes that implemented this protocol on the same Ethernet. There were two options of DECserver 200 hardware: the DECserver 200/MC, which contained RS-232-C lines with full modem control (DSRVB-AB) and the DECserver 200/DL, which contained DECconnect lines with data leads only (DSRVB-BB). The /DL version delivers these data leads through
2760-646: The NCP – Network Control Program in the Front End Processor i.e. 3705 , 3720 , 3725 , 3745 , and VTAM. One of the first groups to write and provide operating system support for the 3270 and its early predecessors was the University of Michigan, who created the Michigan Terminal System in order for the hardware to be useful outside of the manufacturer. MTS was the default OS at Michigan for many years, and
2829-493: The attachment of asynchronous devices. The MMJ segregated a Data from a Voice connection. The DECserver 300 utilized the EIA 423-A electrical interface standard for local connections. EIA 423-A is compatible with the EIA 232-D interface and supports DTR/DSR (Data Terminal Ready/Data Set Ready) signals. EIA 423-A supports longer cable runs and higher signaling speeds. The DECserver 300 implemented
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2898-430: The computer industry. By 1986, terminal server networks accounted for 10% of Digital's $ 10 billion revenue. These early Ethernet LANs scaled using Ethernet bridges (another DEC invention) as well as DECnet routers. Subsequently, Cisco routers, which implemented TCP-IP and DECnet, emerged as a global connection between these packet-based Ethernet LANs. Over time, when terminals became less popular, terminal emulators had
2967-545: 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
3036-596: The data to web pages or GUI interfaces. In the early 1990s a popular solution to link PCs with the mainframes was the Irma board , an expansion card that plugged into a PC and connected to the controller through a coaxial cable. 3270 simulators for IRMA and similar adapters typically provide file transfers between the PC and the mainframe using the same protocol as the IBM 3270 PC . The IBM 3270 display terminal subsystem consists of displays, printers and controllers. Optional features for
3105-540: The different hardware units. The DECserver is configured at the factory to request the correct image at initialization. As well as connecting terminals and being used as standard terminal servers, DECservers also support reverse connections (either LAT, or on later models Telnet ) allowing them to be used as print servers or console servers . The following are the filenames used for the firmware files that get downloaded by various DECserver terminal servers when they boot up and initialize: These filenames are specified in
3174-442: The earliest protocols created to run on a burgeoning TCP/IP based Internet. Additionally, the ability to create reverse direction pathways from users to non-traditional RS232 devices (i.e. UNIX Host TTYS1 operator ports) created an entirely new market for Terminal Servers, now known as console servers in the mid to late 1990s, year 2000 and beyond through today. LAT and VMS drove the initial surge of adoption of thick Ethernet by
3243-551: The firmware file to be loaded. The firmware's filename is not specified in the DECnet database, it is found in a network request from the terminal server. If the firmware file does not exist in the MOM$ SYSTEM directory at the time of a load request, the terminal server will not complete its boot process, and an error message will be displayed on the OpenVMS operator's console (and written to SYS$ MANAGER:OPERATOR.LOG) and this message will give
3312-645: The mixed EBCDIC/APL or text keyboards, which have lower case. Lower-case capability and dead keys were available as an RPQ ( Request Price Quotation ); these were added to the later 3278 & 3279 models. A version of the IBM PC called the 3270 PC , released in October 1983, includes 3270 terminal emulation . Later, the 3270 PC/G (graphics), 3270 PC/GX (extended graphics), 3270 Personal Computer AT, 3270 PC AT/G (graphics) and 3270 PC AT/GX (extended graphics) followed. There are two types of 3270 displays in respect to where
3381-481: The models 2B and 3B supported seven colors, and when equipped with the optional Programmed Symbol Set feature had a loadable character set that could be used to show graphics. The Programmed Symbol Set feature could be added in the field, and was standard in the model S3G. The IBM 3279 with its graphics software support, Graphical Data Display Manager (GDDM), was designed at IBM's Hursley Development Laboratory , near Winchester, England . The 3290 Information Panel
3450-509: The name of the missing file. Local Area Transport Local Area Transport (LAT) is a non-routable ( data link layer ) networking technology developed by Digital Equipment Corporation to provide connection between the DECserver terminal servers and Digital's VAX and Alpha and MIPS host computers via Ethernet , giving communication between those hosts and serial devices such as video terminals and printers. The protocol itself
3519-798: The next reboot. The 500 and 550 models are based on the PDP-11 /53 chipset with 512 kb or 1.5 mb 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
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#17328525230483588-534: The same Ethernet. Software that ran on the DECserver 250 was down-line loaded over the network from a Phase IV DECnet load host. Model Number: DSRVP-** Ports: 7 (see above) Alternate product: None. DECserver 300 The DECserver 300 Terminal Server was an Ethernet Communications Server for Ethernet Local Area Networks, providing a convenient method to logically connect up to sixteen digital asynchronous terminals to one or more service nodes (hosts) on an Ethernet. The DECserver 300 used MMJs (Modified Modular Jacks) for
3657-518: The same features as the DECserver 716, with 32 ports. Model number: DSRVW-K* Ports: 32 RJ45 DECserver ConX4/ConX4P Introduced in 2004, the ConX4 offers the same functionality as the DECserver 90M+ in a smaller port density configuration, with 10/100 LAN connectivity and port speeds to 230.4 kbit/s. Model number: DSC04-** Ports: 4 RJ45 DECserver Operating Software: DNAS (DECserver Network Access Software) includes several software images that run on
3726-592: The terminal throughput of the CPU , and minimizes the data transmitted. Some users familiar with character interrupt-driven terminal interfaces find this technique unusual. There is also a read buffer capability that transfers the entire content of the 3270- screen buffer including field attributes. This is mainly used for debugging purposes to preserve the application program screen contents while replacing it, temporarily, with debugging information. Early 3270s offered three types of keyboards. The typewriter keyboard came in both
3795-503: Was a network terminal switch for Ethernet Local Area Networks, providing a convenient method to logically connect up to eight DIGITAL asynchronous terminals to one or more service nodes (hosts) on an Ethernet. Through the use of a simple command, users could establish a logical connection, called a session, to any local service node that implemented the LAT protocol. Model Number: DSRVA-** Ports: 8 DB25 Alternate product: DECserver 708, 8 ports DB9, DSRVW-R* DECserver 200 The DECserver 200
3864-431: Was a network terminal switch for Ethernet Local Area Networks, providing a convenient method to logically connect up to eight Digital asynchronous terminals to one or more service nodes (hosts) on an Ethernet. The DECserver 200 also provided the capability to connect host systems that did not support the LAT protocol, Digital personal computers, and dial-out modems directly to ports on the server. The DECserver 200 implemented
3933-420: Was able to support up to 17,500 3270 terminals under CICS . Most 3270 devices are clustered , with one or more displays or printers connected to a control unit (the 3275 and 3276 included an integrated control unit). Originally devices were connected to the control unit over coaxial cable; later Token Ring , twisted pair , or Ethernet connections were available. A local control unit attaches directly to
4002-412: Was also a TEST REQ key. When one of these keys is pressed, it will cause its control unit to generate an I/O interrupt to the host computer and present an Attention ID (AID) identifying which key was pressed. Application program functions such as termination, page-up, page-down, or help can be invoked by a single key press, thereby reducing the load on very busy processors. A downside to this approach
4071-599: Was an Ethernet Communications Server for Ethernet Local Area Networks (LANs), configurable to provide 128 EIA-423-A or 64 RS-232 asynchronous port connections to DEC asynchronous terminals. Both RS-232, via the 8 port CXY08 Q-Bus communication option card, and EIA-423-A, via the 16 port CXA16 communication option card and EIA-422 16 port CXB16 communication option card could be mixed together in any combination from two to eight cards in one server. The DECserver 510 and 550 would also support CXM04 IBM 3270 Terminal option cards, but on VMS only. The DECserver 500 series server provided
4140-729: 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
4209-551: Was available for VM, but little used) and the XEDIT editors for VM/SP through z/VM make extensive use of 3270 features. Customer Information Control System (CICS) has support for 3270 panels. Indeed, from the early 1970s on, CICS applications were often written for the 3270. Various versions of Wylbur have support for 3270, including support for full-screen applications. McGill University's MUSIC/SP operating system provided support for 3270 terminals and applications, including
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#17328525230484278-582: Was configured with four 68-pin D-connectors (two for the DECserver 900GMx), and provided full or limited modem control. Each port supported sixteen data rates from 75 bit/s to 115.2 kbit/s. The DECserver 900GM included 4 MB of standard memory, and could be expanded to 8 MB. Model Number: DSRVY-** Ports:2-4 Type: 68-pin Champ connectors Alternate product: DECserver 708, 8 ports DB9 or DECserver 716, 16 ports RJ45 DECserver 900TM The DECserver 900TM
4347-419: Was designed in such a manner as to maximize packet efficiency over Ethernet by bundling multiple characters from multiple ports into a single packet for Ethernet transport. One LAT strength was efficiently handling time-sensitive data transmission. Over time, other host implementations of the LAT protocol appeared allowing communications to a wide range of Unix and other non-Digital operating systems using
4416-411: Was introduced in 2003. A full function asynchronous device and remote access server, it provides eight local or remote asynchronous RJ45 connections over Ethernet LANs. Internal flash is 4 MB. Memory is 8 MB. This product also supports upgradeable ROM code. The DECserver 90M+ supports up to eight sessions per port. It runs DECserver Network Access Software (DNAS). Unlike the DECserver 90M models,
4485-555: Was replaced in 1993 with the –E* and –F* models. The original units ran DECserver 700 software and were configured with 1 MB of operational memory. The follow on units were configured with 4 MB of operational memory, an internal slot for a 2 MB Flash card and ran DNAS (DECserver Network Access Software). The –E* and –F* were retired in 2002. Model number: DSRVW-A*, DSRVW-B*, DSRVW-E*, DSRVW-F* Ports: 8 DB25 Replaced by: DECserver 708, 8 ports DB9 or DECserver 716, 16 ports RJ45 DECserver 700-16 The original DECserver 700-16
4554-517: Was replaced in 1993 with the –G* and –H* models. The original units ran DECserver 700 software and were configured with 1 MB of operational memory. The –G* and –H* models were configured with 4 MB of operational memory, an internal slot for a 2 MB Flash card and ran DNAS (DECserver Network Access Software). The –G* and –H* were retired in 2001. Model numbers: DSRVW-C*, DSRVW-D*, DSRVW-G*, DSRVW-H* Ports: 16 RJ45 Replaced by: DECserver 716; DECserver 732 DECserver 90M+ The DECserver 90M+
4623-607: Was still used at Michigan well into the 1990s. Many manufacturers, such as GTE , Hewlett-Packard , Honeywell /Incoterm Div, Memorex , ITT Courier , McData , Harris, Alfaskop and Teletype / AT&T created 3270 compatible terminals, or adapted ASCII terminals such as the HP 2640 series to have a similar block-mode capability that would transmit a screen at a time, with some form validation capability. The industry distinguished between 'System compatible controllers' and 'Plug compatibility controllers', where 'System compatibility' meant that
4692-464: Was that vi -like behavior, responding to individual keystrokes, was not possible. For the same reason, a port of Lotus 1-2-3 to mainframes with 3279 screens did not meet with success because its programmers were not able to properly adapt the spreadsheet's user interface to a screen at a time rather than character at a time device. But end-user responsiveness was arguably more predictable with 3270, something users appreciated. Following its introduction
4761-595: Was widely used as an IBM mainframe terminal before PCs became commonly used for the purpose. It was part of the 3270 series, using the 3270 data stream . Terminals could be connected to a 3274 controller, either channel connected to an IBM mainframe or linked via an SDLC ( Synchronous Data Link Control ) link. In the Systems Network Architecture (SNA) protocol these terminals were logical unit type 2 (LU2). The basic models 2A and 3A used red, green for input fields, and blue and white for output fields. However,
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