Download System BIOS for IBM PCs, compatibles, and EISA computers : by Phoenix Technologies PDF

By Phoenix Technologies

The second one variation of this bestselling consultant covers the subsequent new release Phoenix BIOS, utilized in significant laptop appropriate, EISA, and 486-based desktops. somebody constructing software program for those machines wishes this significant info

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Additional info for System BIOS for IBM PCs, compatibles, and EISA computers : the complete guide to ROM-based system software

Example text

A DMA device that uses ISA-

The 8087 is wired in parallel with the CPU - the CPU's status (50-S2) and queue status lines (QSD-QS1) enable the 8087 to obtain and decode instructions in synchronization with the CPU. 80287 and 80387 coprocessor hardware Interlace The 80287 and 80387 coprocessors function as I/O devices. They are internally divided into two independent functional areas: the Bus Interface Unit (BIU) and Numeric Execution Unit (NEU). The BIU communicates with the CPU through I/O ports F8h, FAh, and FCh. An 80287 or 80387 coprocessor can operate in either the real or protected address mode.

Level-sensitive interrupts are signalled by a continuous logic-level voltage. This method has the advantage of uniquely identifying the signal's originator. As a result, more than one peripheral can share the same interrupt. This method also has the advantage of being less susceptible to disruption by random electrical pulses and noise. 28 System BIOS for IBM pes, Compatibles, and EISA Computers Direct Memory Access Introduction The XT-ISA-EISA specifications support direct memory access (DMA).

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