Colour Display System SEMIGRAF 240 - The history of Ericsson

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Colour Display System SEMIGRAF 240 Bjorn Karbeus This article presents the new computerized colour display system SEMIGRAF 240. which replaces conventional types of control panels. SEMIGRAF 240 has been developed by SRA Communications AB, a member of the Ericsson Group. UDC681 326: 621.397 132 Fig. 1 Control room with display units that form the opera tor pane I for control of an ore dressing plant The transition from the earlier manual control and supervisory systems of various types to computerized systems makes new demands on the units that transfer orders and information between operator and system. For a long time various types of control panels with instruments, switches and controls provided the normal solution. In large systems such control panels can be very extensive, and can sometimes take up a whole wall. They are therefore expensive and difficult to change. An improvement was achieved by introducing various types of black/white graphic displays as operator units. The operator could then fetch information from the system, and also control it by feeding in various commands. However, in many cases it proved to be difficult for an operator to assimilate the displayed information quickly and correctly. The introduction of colour as an aid in the structurization of the displayed pictures made it very much easier to recognise and understand the information shown. Background SRA Communications AB have worked on different types of displays, both black/white and colour since 1969. SEMIGRAF is the registered trade mark for colour display systems manufactured by SRA. The first system, designed SEMIGRAF 210, was delivered in 1974 and since then many systems have been supplied for a number of different applications, such as power supervision, ore dressing, railway control and supervision of coaxial cable networks.
BJORN KARBEUS SRA Communications AB To the computer Fig. 2 A SEMIGRAF system consists primarily of a control unit, colour TV and keyboard. A light-pen can be added as an accessory for interactive work with the display. A picture is stored and generated in the control unit tor display on the colour monitor. Signals representing red, green and blue beams and for synchronization go from the control unit to the colour monitor. Input takes place via a keyboard Fig. 3 The control unit is the central unit for picture generation. The picture to be displayed is stored in the picture store. The character generator interprets the content ot the picture store and generates the characters to be displayed on the screen. The video unit converts the digital signals to analog signals for operating the colour monitor. The time base generates timing and control signals for the various parts of the control unit. The 8-bit processor is the administrative unit, which via the I/O unit handles the communication with the keyboard and the main computer Display SEMIGRAF 240 is the newest member of the SEMIGRAF family. Utilization of the new integrated circuits, which have become available during the last few years as a result of the great advances in semiconductor technology, has made Keyboard 87 possible the design of an equipment with a performance which only a few years ago could hardly have been attained within a limited framework. A SEMIGRAF 240 system consists of a varying number of units depending on the application, fig. 2.
Page 1: ERICSSON REVIEW 3 1978 COLOUR DISPL
Page 6 and 7: 88 Fig. 4 The three beams red, gree
Page 8 and 9: 90 Fig. 8 Keyboard for SEMIGRAF 240
Page 10 and 11: Operational Experience of ANA 30 in
Page 12 and 13: 94 Fig. 3 Changing subscriber categ
Page 14 and 15: New Generation of 120 and 480-Chann
Page 16 and 17: 98 Fig. 3 Translation of basic supe
Page 18 and 19: 100 Fig. 6 Line terminating shelf s
Page 20 and 21: Fig. 10 Branching for direct termin
Page 22 and 23: Fig. 16 Housing for one line repeat
Page 24 and 25: AXB 20 - Operation and Maintenance
Page 26 and 27: Fig. 4 Display terminal connected t
Page 28 and 29: 110 Fig. 8 Procedure for changing d
Page 30 and 31: System data for AXB 20 Application
Page 32: TELEFONAKTIEBOLAGETLM ERICSSON ISSN

Colour Display System SEMIGRAF 240 - The history of Ericsson

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