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Using the 24-bit memory addressing capabilities of the 286 CPU architecture, a total address space of 16 MB was accessible. Memory above the 1 MB limit was called extended memory. However the area between 640 KB and 1 MB was reserved for hardware addressing in IBM PC compatibles.
1 MB = 1 024 000 bytes (= 1000×1024 B) is the definition used to describe the formatted capacity of the 1.44 MB 3.5-inch HD floppy disk, which actually has a capacity of 1 474 560 bytes. [ 5 ] Randomly addressable semiconductor memory doubles in size for each address lane added to an integrated circuit package, which favors counts that are ...
File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte. A large value is often expressed with a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). [1]
The exponential growth of PC memory sizes, driven by the equally exponential drop in memory prices, was also a factor in this, as the duration of a memory test using a given CPU is directly proportional to the memory size. The original IBM PC could be equipped with as little as 16 KB of RAM and typically had between 64 and 640 KB; depending on ...
7.84 MB/s: PC Card 16-bit 100 ns byte mode: 80 Mbit/s: 10 MB/s: PC Card 16-bit 100 ns word mode: 160 Mbit/s: 20 MB/s: PC Card 32-bit (CardBus) byte mode: 267 Mbit/s: 33.33 MB/s: ExpressCard 1.2 USB 2.0 mode: 480 Mbit/s: 60 MB/s: 2003 PC Card 32-bit (CardBus) word mode: 533 Mbit/s: 66.66 MB/s: PC Card 32-bit (CardBus) doubleword mode: 1067 Mbit ...
Historical lowest retail price of computer memory and storage Electromechanical memory used in the IBM 602, an early punch multiplying calculator Detail of the back of a section of ENIAC, showing vacuum tubes Williams tube used as memory in the IAS computer c. 1951 8 GB microSDHC card on top of 8 bytes of magnetic-core memory (1 core is 1 bit.)
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The Intel 8088 CPU, used in the original IBM PC, was able to address 1 MB (2 20 bytes), since the chip offered 20 address lines. In the design of the PC, the memory below 640 KB was for random-access memory on the motherboard or on expansion boards, and it was called the conventional memory area.