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When writing to memory, the CPU writes data from MDR to the memory location whose address is stored in MAR. MAR, which is found inside the CPU, goes either to the RAM (random-access memory) or cache. The MAR register is half of a minimal interface between a microprogram and computer storage; the other half is a MDR.
The memory data register is half of a minimal interface between a microprogram and computer storage; the other half is a memory address register (MAR). During the read/write phase, the Control Unit generates control signals that direct the memory controller to fetch or store data.
The 8086/8088, 80186/80188, and 80286 processors, if provided an 8087, 80187 or 80287 co-processor for floating-point operations, support an 80-bit wide, 8 deep register stack with some instructions able to use registers relative to the top of the stack as operands; without a co-processor, no floating-point registers are supported. IA-32 [8] 8
But the greater speed attainable by direct control of hardware was of particular importance, especially when running computer games. So very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBM hardware , and only a single version of MS-DOS for a fixed hardware platform was all that ...
Tandy upgraded the TRS-80 with a much improved Microsoft 8K "Level II BASIC", and an "expansion interface" which added 32 KB RAM, A floppy disk and a printer interface. With these extras the TRS-80 became a viable small business computer. 8 Jun 1978: US Introduction of the 16-bit Intel 8086, the first x86 microprocessor.
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The Nikkei Personal Computing magazine wrote, "The PC-98 features a number of MS-DOS applications, but there is no difference between PC-98 and PC/AT clones for using Windows 95. The status of the PC-98 series is not based on its hardware feature or the number of softwares and peripherals, but its strength in promotion, parts procurement and ...