surplus machines for computer use. Custom-designs keyboard/printer terminals that came later included the IBM 2741 (1965) and the DECwriter (1970). Respective top speeds of teletypes, IBM 2741 and the LA30 (an early DECwriter) were 10, 15 and 30 characters per second. Although at that time "paper was king" the speed of interaction was relatively limited. The DECwriter was the last major printing-terminal product. It faded away after 1980 under pressure from video display units (VDUs), with the last revision (the DECwriter IV of 1982) abandoning the classic teletypewriter form for one more resembling a desktop printer. VDUs A video display unit (VDU) displays information on a screen rather than printing text to paper and typically uses a cathode-ray tube (CRT). Due to that technology these devices were often called "CRTs". VDUs in the 1950s were typically designed for displaying graphical data rather than just text. CRT displays in that time frame were used in, e.g., experimental computers at MIT; Commercial computer from, e.g., DEC, ERA, IBM, UNIVAC; military computers for, e.g., BMEWS, BUIC, SAGE. Two early landmarks in the development of the VDU were the Univac Uniscope 300 and the IBM 2260, both in 1964. Both were block-mode terminals designed to ship a page at a time, rather than character-mode devices. The Hazeltine 2000 of 1970 was a notable later product of the same kind. The Datapoint 3300 from Computer Terminal Corporation, announced in 1967 and shipped in 1969, was a character-mode device that emulated a Model 33 Teletype. This reflects the fact that early character-mode terminals were often deployed to replace teletype machines as a way to reduce operating costs. The next generation of VDUs went beyond teletype emulation with an addressable cursor that gave them the ability to paint two-dimensional displays on the screen. Despite this, early devices of this type were often called "Glass TTYs". The classic era of the VDU began in the early 1970s and was closely intertwined with the rise of time sharing computers. Important early products were the ADM-3A, VT52, and VT100. These devices used no CPU, instead relying on individual logic gates or very primitive LSI chips. This made them inexpensive and they quickly became extremely popular Input-Output devices on many different types of computer system, often replacing earlier and more expensive printing terminals. After 1970 several suppliers gravitated to a set of common standards: ASCII character set (rather than, say, EBCDIC