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

By Phoenix Technologies

The second one variation of this bestselling advisor covers the following new release Phoenix BIOS, utilized in significant notebook suitable, EISA, and 486-based desktops. somebody constructing software program for those machines wishes this crucial details

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

The second one variation of this bestselling advisor covers the subsequent new release Phoenix BIOS, utilized in significant computing device suitable, EISA, and 486-based pcs. someone constructing software program for those machines wishes this crucial details

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

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First byte of each pair is column; second byte is row. 0,0 is upper left corner of screen. INTIOh 4O:60h 1 Word Cursor type defined as 6845-

80386- and 80486-based ISA systems have to be divided into "on-board" and "expansion-slot" portions. High-speed memory, for example, has to be implemented on the system board via a native 80386 bus because the ISA expansion bus is slow (8 MHz) and only has a 16-bit wide data path. Several strategies have been applied to get around the expansion-slot bottleneck. " New methods in CMOS design and fabrication have made it possible to integrate the functions of most of the AT peripheral circuits into a few, compact chips.

A system of edge-triggered interrupts is simple to implement, but has some problems: Ii s II Since the decoding logic isn't able to distinguish between devices, two peripherals cannot share an edge-triggered interrupt. False interrupts can be registered by transient electrical pulses and noise. Genuine interrupts can be lost when two interrupts occur simultaneously. Level-sensitive interrupts are signalled by a continuous logic-level voltage. This method has the advantage of uniquely identifying the signal's originator.

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