AT&T 6300 Service Manual page 33

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Table of Contents

SYSTEM OVERVIEW

The Motherboard ROM contains the Resident Diagnostics and

Bootstrap Loader programs. Two EPROM chips provide a total of

16 KB of Programmable Read-Only Memory. The ROMs physically

occupy addresses FOOOO to FFFFF. Following power-up or reset,

the 8086 CPU always begins execution at location FFFFO that

contains a jump instruction. This jump instruction directs the

system to the initial Resident Diagnostic routine and then to the

Bootstrap Loader. The ROMs also contain drivers for the

Keyboard, Mini-Floppy Disk, Hard Disk, and other peripherals

along with initialization programs for Large Scale Integration

(LSI) chips.