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2. Intel Inboard 386 - Wikipedia

   en.wikipedia.org/wiki/Intel_Inboard_386

   The family comprised the Intel Inboard 386/AT and Intel Inboard 386/PC, which allowed users to upgrade an IBM AT or an IBM PC (or compatible) respectively. The boards allowed users to upgrade their machines' CPU to a 16 MHz 80386 processor. Both variants utilized a ribbon cable which plugged into the computer's original CPU socket on one end ...

3. IBM Personal Computer - Wikipedia

   en.wikipedia.org/wiki/IBM_Personal_Computer

   RAM cards could upgrade either variant further, [55] for a total of 640 KB conventional memory, and possibly several megabytes of expanded memory beyond that, though on PC/XT-class machines, the latter was a very expensive third-party hardware option only available later in the IBM 5150's lifecycle and only usable with dedicated software ...

4. Enhanced Graphics Adapter - Wikipedia

   en.wikipedia.org/wiki/Enhanced_Graphics_Adapter

   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. [22] Without these upgrades, the card would be limited to four colors in 640 × 350 mode. [23]

5. List of IBM Personal Computer models - Wikipedia

   en.wikipedia.org/wiki/List_of_IBM_Personal...

   The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT, the AT, the Convertible, and the /370 systems, among others), from 1981 to 1987. It eventually gave way to many splintering product lines after IBM introduced the Personal System/2 in April 1987.

6. Shared graphics memory - Wikipedia

   en.wikipedia.org/wiki/Shared_graphics_memory

   A notable exception was the IBM PC. Graphics display was facilitated by the use of an expansion card with its own memory plugged into an ISA slot. The first IBM PC to use the SMA was the IBM PCjr, released in 1984. Video memory was shared with the first 128 KiB of RAM. The exact size of the video memory could be reconfigured by software to meet ...

7. Conventional memory - Wikipedia

   en.wikipedia.org/wiki/Conventional_memory

   Memory areas of the IBM PC family. In DOS memory management, conventional memory, also called base memory, is the first 640 kilobytes of the memory on IBM PC or compatible systems. It is the read-write memory directly addressable by the processor for use by the operating system and application programs.