Build Your Own Microcomputer Based On The Intel 8088 Pdf

Build Your Own Microcomputer Based On The Intel 8088 Pdf

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Unlike older 8085-based systems, which used a single external clock generator, the IBM PC used a single CLKIN input from the main power supply, and a single 128-volt supply for the CPU, which was a 6U, 210-mm memory power supply unit. This also provided a ground, +5 volt power supply to the CPU, a 5 volt power supply to audio, and +12 volt power supplies to data busses. The IBM PC also used an internal power supply, which fed the system components with +12 and +5 volt power supplies. The video display was controlled by the same base sheet microprocessor that took care of the keyboard and mouse. Overall, the IBM PC used two-thirds of the power of the IBM XT (which used a Motorola or Zilog Z80 microprocessor) and one-third of the power of the AT and its derivatives (which used the 8088 and 68008 from Motorola).[citation needed]

Because Intel offered its chips at a better price than other manufacturers, IBM's engineers chose to go with the 8088, even though some engineers at the company were considering the Motorola 68000 chip. The more expensive Motorola 68000 chips were used in the IBM XT, AT, and even the Macintosh. d2c66b5586