The IBM 2780 and the IBM 3780 are devices developed by IBM for performing remote job entry (RJE) and other batch functions over telephone [a] lines; they communicate with the mainframe via Binary Synchronous Communications (BSC or Bisync) and replaced older terminals using synchronous transmit-receive (STR). In addition, IBM has developed workstation programs for the 1130, 360/20, 2922, System/360 other than 360/20, System/370 and System/3.
The 2780 Data Transmission Terminal first shipped in 1967. [1] It consists of:
The 2780 is capable of local (offline) card to print operation.
It comes in four models: [3]
The 2780 uses a dedicated communication line at speeds of 1200, 2000, 2400 or 4800 bits per second. It is a half duplex device, although full duplex lines can be used with some increase in throughput. It can communicate in Transcode (a 6-bit code), 8-bit EBCDIC, or 7-bit ASCII.
The 2770, announced in 1969, "was said to surpass all other IBM terminals in the variety of available input-output devices." [4] The 2770 was developed by the IBM General Products Division (GPD) in Rochester, MN. [5]
It comes standard with a desktop terminal with keyboard. The printer and other devices (any two in any combination) can be attached to the 2772 Multi-Purpose Control unit. [6] Possible devices include:
In May 1972, IBM announced the IBM 3780, an enhanced version of the 2780. [7] The 3780 was developed by IBM's Data Processing Division (DPD). [8] There is one model, with an optional card punch.
The 3780 drops Transcode support and incorporates several performance enhancements. It supports compression of blank fields in data using run-length encoding. It provides the ability to interleave data between devices, introduces double buffering, and adds support for the Wait-before-transmit ACKnowledgement (WACK) and Temporary Text Delay (TTD) Binary Synchronous control characters. [9]
The IBM 2780 and 3780 were later emulated on various types of equipment, including eventually the personal computer. A notable early emulation was the DN60, by Digital Equipment Corporation in the late 1970s. [11]
In 1974 IBM Data Processing Division (DPD) offered a successor to the 3780, called the 3770 Data Communications System, supporting SDLC, BSC, BSC Multi-leaving [12] and SNA, depending on the configuration. [13] The 3770 is a family of desk console style terminals that offers a variety of keyboard and printer combinations as well as I/O equipment attachment and communications features.
The terminals come built into a desk and include the following models: [14]
The following I/O devices can be attached to a 3770 terminal:
IBM distributes workstation programs with systems software including
Except for the RJE workstation programs in OS/360, these programs use a variation of BSC known as Multi-leaving. [12] In addition, IBM provides separately ordered workstation programs using BSC. Systems Network Architecture (SNA) and TCP/IP.
Workstation programs are available from IBM and third-party vendors to support all of these protocols:
The IBM 2780 and the IBM 3780 are devices developed by IBM for performing remote job entry (RJE) and other batch functions over telephone [a] lines; they communicate with the mainframe via Binary Synchronous Communications (BSC or Bisync) and replaced older terminals using synchronous transmit-receive (STR). In addition, IBM has developed workstation programs for the 1130, 360/20, 2922, System/360 other than 360/20, System/370 and System/3.
The 2780 Data Transmission Terminal first shipped in 1967. [1] It consists of:
The 2780 is capable of local (offline) card to print operation.
It comes in four models: [3]
The 2780 uses a dedicated communication line at speeds of 1200, 2000, 2400 or 4800 bits per second. It is a half duplex device, although full duplex lines can be used with some increase in throughput. It can communicate in Transcode (a 6-bit code), 8-bit EBCDIC, or 7-bit ASCII.
The 2770, announced in 1969, "was said to surpass all other IBM terminals in the variety of available input-output devices." [4] The 2770 was developed by the IBM General Products Division (GPD) in Rochester, MN. [5]
It comes standard with a desktop terminal with keyboard. The printer and other devices (any two in any combination) can be attached to the 2772 Multi-Purpose Control unit. [6] Possible devices include:
In May 1972, IBM announced the IBM 3780, an enhanced version of the 2780. [7] The 3780 was developed by IBM's Data Processing Division (DPD). [8] There is one model, with an optional card punch.
The 3780 drops Transcode support and incorporates several performance enhancements. It supports compression of blank fields in data using run-length encoding. It provides the ability to interleave data between devices, introduces double buffering, and adds support for the Wait-before-transmit ACKnowledgement (WACK) and Temporary Text Delay (TTD) Binary Synchronous control characters. [9]
The IBM 2780 and 3780 were later emulated on various types of equipment, including eventually the personal computer. A notable early emulation was the DN60, by Digital Equipment Corporation in the late 1970s. [11]
In 1974 IBM Data Processing Division (DPD) offered a successor to the 3780, called the 3770 Data Communications System, supporting SDLC, BSC, BSC Multi-leaving [12] and SNA, depending on the configuration. [13] The 3770 is a family of desk console style terminals that offers a variety of keyboard and printer combinations as well as I/O equipment attachment and communications features.
The terminals come built into a desk and include the following models: [14]
The following I/O devices can be attached to a 3770 terminal:
IBM distributes workstation programs with systems software including
Except for the RJE workstation programs in OS/360, these programs use a variation of BSC known as Multi-leaving. [12] In addition, IBM provides separately ordered workstation programs using BSC. Systems Network Architecture (SNA) and TCP/IP.
Workstation programs are available from IBM and third-party vendors to support all of these protocols: