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EMS supported 16 MB of space. Using a quirk in the 286 CPU architecture, the high memory area (HMA) was accessible, as the first 64 KB above the 1 MB limit of 20-bit addressing in the x86 architecture. Using the 24-bit memory addressing capabilities of the 286 CPU architecture, a total address space of 16 MB was accessible.
This allowed 16-bit real-mode DOS programs to access several megabytes of RAM through a hole in real memory, typically (0xE000–0xEFFF). A program would then have to explicitly request the page to be accessed before using it. These memory locations could then be used arbitrarily until replaced by another page.
Extended memory is located above 1 MB, includes the high memory area, and ends at 16 MB on the Intel 286 and at 4 GB on the Intel 386DX and later. In DOS memory management, extended memory refers to memory above the first megabyte (2 20 bytes) of address space in an IBM PC or compatible with an 80286 or later processor.
Four SIMM slots were provided and the computer shipped with four 256 KB SIMMs, for 1 MB total RAM. By replacing them with 1 MB SIMMs, it was possible to have 4 MB of RAM. (Although 30-pin SIMMs could support up to 16 MB total RAM, the Mac Plus motherboard had only 22 address lines connected, for a 4 MB maximum.)
30-pin SIMM, 256 KB capacity Two 30-pin SIMM slots on an IBM PS/2 Model 50 motherboard. Standard sizes: 256 KB, 1 MB, 4 MB, 16 MB. 30-pin SIMMs have 12 address lines, which can provide a total of 24 address bits. With an 8-bit data width, this leads to an absolute maximum capacity of 16 MB for both parity and non-parity modules (the additional redundancy-bit chip usually doe
One high density 3.5 inch 1.44 MB floppy drive comes installed. There are three 16-bit expansion slots, all of which run at the full CPU clock rate of 10 MHz. One megabyte of RAM comes installed, and using expansion slots RAM can go to 16 MB (the maximum addressable by the 286). The motherboard has a built-in SmartDrive hard drive controller.
Intel Pentium 100 MHz, 16 MB RAM (32 MB max.), 810 MB hard disk, 6.1" TFT display (released only in Japan) 210×115×34: 850 Libretto M2
The X-MP initially supported 2 million 64-bit words (16 MB) of main memory in 16 banks, respectively. [citation needed] The main memory was built from 4 Kbit bipolar SRAM ICs. [citation needed] CMOS memory versions of the Cray-1M were renamed Cray X-MP/1s. This configuration was first used for Cray Research's UNIX port.
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