IBM 2250

IBM 2250

The IBM 2250 Graphics Display Unit was announced as part of System/360 in 1964. Unlike most modern computer displays, which show images in raster format, the IBM 2250 used vector graphics. A display list of line segments (vectors) on a 1024 by 1024 grid was stored in the computer's memory and repainted on the 2250's CRT up to 40 time per second. Characters were built of line segments specified by display list subroutines. Thus any character set or font could be displayed. The computer altered the display by changing the display list. As the display list got longer, the refresh time got longer too and eventually the display would start to flicker.

The 2250 was housed in a desk with an alphanumeric (QWERTY) keyboard and a separate programmed function keyboard which had keys, indicator lights and switches. A plastic overlay label could be placed over the function keyboard. Punches on the top edge of the overlay could be sensed by the computer so the keys, lights and switches could be reprogrammed simply by changing overlays. The 2250's CRT measured 21" diagonal, but the useful display area was 12 inch by 12 inch. A light pen was provided as a pointing device, serving the function of the modern computer mouse.

An IBM 2285 Display Copier could be attached to the 2250 to provide 8-1/2 by 11 inch hard copy of the display contents under operator control.

ee also

*IBM 740


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • IBM 1130 — The IBM 1130 Computing System was introduced in 1965. It was IBM s least expensive computer to date, and was aimed at price sensitive, computing intensive technical markets like education and engineering. The IBM 1800 was a process control… …   Wikipedia

  • IBM 1130 — Consola IBM 1130, en proceso de restauración. El Sistema de Computación IBM 1130 fue introducido en 1965.[1] Era el equipo menos caro de IBM, y apuntaba al mercado de bajo costo de computación técnica intensiva, como la ingeniería y la educación …   Wikipedia Español

  • IBM 740 — The IBM 740 CRT Recorder was announced in 1954 and used with the IBM 701, IBM 704, and IBM 709 computers to draw vector graphics images on 35 mm photographic film (i.e. microfilm). The 740 film recorder contained digital to analog converters and… …   Wikipedia

  • IBM 1130 — et 1800 Les modèles IBM 1130 et 1800 d International Business Machines Corporation sont des ordinateurs de la période fin des années 60, début des 70. Le 1130 était destiné aux laboratoires, universités, bureaux d études et écoles d ingénieurs;… …   Wikipédia en Français

  • IBM 1130 Et 1800 — Les modèles IBM 1130 et 1800 d International Business Machines Corporation sont des ordinateurs de la période fin des années 60, début des 70. Le 1130 était destiné aux laboratoires, universités, bureaux d études et écoles d ingénieurs; le 1800… …   Wikipédia en Français

  • IBM 1800 — IBM 1130 et 1800 Les modèles IBM 1130 et 1800 d International Business Machines Corporation sont des ordinateurs de la période fin des années 60, début des 70. Le 1130 était destiné aux laboratoires, universités, bureaux d études et écoles d… …   Wikipédia en Français

  • Ibm 1130 et 1800 — Les modèles IBM 1130 et 1800 d International Business Machines Corporation sont des ordinateurs de la période fin des années 60, début des 70. Le 1130 était destiné aux laboratoires, universités, bureaux d études et écoles d ingénieurs; le 1800… …   Wikipédia en Français

  • IBM System/360 — The IBM System/360 (S/360) is a mainframe computer system family announced by IBM on April 7, 1964. It was the first family of computers making a clear distinction between architecture and implementation, allowing IBM to release a suite of… …   Wikipedia

  • IBM 1130 et 1800 — Les modèles IBM 1130 et 1800 d International Business Machines Corporation sont des ordinateurs de la période fin des années 60, début des 70. Le 1130 était destiné aux laboratoires, universités, bureaux d études et écoles d ingénieurs; le 1800… …   Wikipédia en Français

  • List of IBM products — The following is a list of notable products from the International Business Machines (IBM) Corporation and its predecessor corporations, beginning in the 1890s, and spanning punched card machinery, time clocks, and typewriters, via mainframe… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”