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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. An optional daughter-board (the Graphics Memory Expansion Card) provided a minimum of 64 KB additional RAM, and up to 192 KB if fully populated with the Graphics Memory Module Kit. [23]
The CGA card was succeeded in the consumer space by IBM's Enhanced Graphics Adapter (EGA) card, which supports most of CGA's modes and adds an additional resolution (640 × 350) as well as a software-selectable palette of 16 colors out of 64 in both text and graphics modes.
The PS/2 chipset's limited abilities prevent EGA compatibility and high-resolution multi-color VGA display modes. The tenure of MCGA was brief; the PS/2 Model 25 and Model 30 were discontinued by 1992, and the only manufacturer to produce a clone of this display adapter was Epson , in the Equity Ie and PSE-30 , since the VGA standard introduced ...
The PGC was, at the time of its release, the most advanced graphics card for the IBM XT and aimed for tasks such as CAD. [ 2 ] Introduced in 1984, [ 3 ] the Professional Graphics Controller offered a maximum resolution of 640 × 480 with 256 colors on an analog RGB monitor , at a refresh rate of 60 hertz—a higher resolution and color depth ...
The same two video cards, the MDA and the CGA, remained available for the PC XT, and no upgraded video hardware was offered by IBM until the EGA, which followed the introduction of the IBM Personal Computer/AT, with its full 16-bit bus design, in 1984.
TGA graphics are built into the motherboards of Tandy computers. The PCjr uses a custom monitor with a unique 18-pin plug, [15] but an adapter (with the same DE-9 connector and pinout as IBM's CGA/EGA) can connect it to the IBM Color Display or similar 4-bit digital RGBI monitor. [16] The Tandy 1000 provides the DE-9 connector directly. [17]
Early examples include the IBM EGA video adapter. [2] Several standards existed for feature connectors, depending on the bus and graphics card type. Most of them were simply an 8, 16 or 32-bit wide internal connector, transferring data between the graphics card and another device, bypassing the system's CPU and memory completely.
The CGA and MDA support in the BIOS proper was maintained through the IBM PC XT and PC AT product lines (which did support option ROMs), so that those cards worked (with full BIOS support) in those machines. The first PC video adapter card that had an option ROM was the IBM EGA, introduced in 1984 with the IBM PC AT.