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The Enhanced Graphics Adapter ... IBM MDA, CGA and EGA monitors, all supported by the EGA card. The original IBM EGA was an 8-bit PC ISA card with 64 KB of onboard RAM.
The Monochrome Display Adapter (MDA, also MDA card, Monochrome Display and Printer Adapter, MDPA) is IBM's standard video display card and computer display standard for the IBM PC introduced in 1981. The MDA does not have any pixel-addressable graphics modes, only a single monochrome text mode which can display 80 columns by 25 lines of high ...
It was offered with a Monochrome Display Adapter (MDA) or a Color Graphics Adapter (CGA). The MDA is a text mode-only display adapter, without any graphic ability beyond using the built-in code page 437 character set (which includes half-block and line-drawing characters), and employed an original IBM green monochrome monitor; only black, green ...
Enhanced Graphics Adapter The Hercules Graphics Card ( HGC ) is a computer graphics controller formerly made by Hercules Computer Technology, Inc. that combines IBM 's text-only MDA display standard with a bitmapped graphics mode, also offering a parallel printer port .
Back of a CGA Video Adapter board, with the RCA composite output connector visible on the right. The Color Graphics Adapter uses a standard RCA connector for connection to an NTSC-compatible television or composite video monitor. [3] The connector on the card is female and the one on the monitor cable is male.
The 5151 was designed to work with the PC's Monochrome Display Adapter (MDA) text-only graphics card, but the third-party Hercules Graphics Card became a popular companion to the 5151 screen because of the Hercules' comparatively high-resolution bitmapped 720×348 pixel monochrome graphics capability, much used for business presentation ...
The original IBM PC MDA display adapter stored the code page 437 character glyphs as bitmaps eight pixels wide, but for visual enhancement displayed them every nine pixels on screen. This range of characters had the eighth pixel column duplicated by special hardware circuitry, [ 22 ] thus filling in gaps in lines and filled areas.
The Hercules Graphics Card included a "Centronics compatible" parallel printer port, the same as the IBM Monochrome Display and Printer Adapter board that the card was based on. [7] The company also produced CGA compatible cards, and with the unsuccessful Hercules InColor Card, it tried to go head-to-head with the Enhanced Graphics Adapter (EGA).