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IBM Personal Computer XT Keyboard and IBM Portable Personal Computer Keyboard Description PDF

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Preview IBM Personal Computer XT Keyboard and IBM Portable Personal Computer Keyboard Description

---------,----- PHearrsdownarl eC Roemfepruetnecre Library Technical Reference Revised Edition (April 1984) The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law: International Business Machines Corporation provides this manual "as is," without warranty of any kind, either expressed or implied, including, but not limited to the particular purpose. IBM may make improvements and/or changes in the product(s) and/or the program(s) described in this manual at any time. This product could include technical inaccuracies or typographical errors. Changes are made periodically to the information herein; these changes will be incorporated in new editions of the publication. It is possible that this material may contain reference to, or information about, IBM products (machines or programs), programming, or services that are not announced in your country. Such references or information must not be construed to mean that IBM intends to announce such IBM products, programming, or services in your country. Products are not stocked at the address below. Requests for copies of this product and for technical information about the system should be made to your authorized IBM Personal Computer dealer. The following paragraph applies only to the United States and Puerto Rico: A Reader's Comment Form is provided at the back of this publication. If the form has been removed, address comments to: IBM Corp., Personal Computer, P.O. Box 1328-C, Boca Raton, Florida 33432. IBM may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligations whatever. © Copyright International Business Machines Corporation 1981, 1982, 1983, 1984 Federal Communications Commission Radio Frequency Interference Statement Warning: The equipment described herein has been certified to comply with the limits for a Class B computing device, pursuant to Subpart J of Part 15 of the FCC rules. Only peripherals (computer input/output devices, terminals printers, etc.) certified to comply with the Class B limits may be attached to the computer. Operation with non-certified peripherals is likely to result in interference to radio and TV reception. If peripherals not offered by IBM are used with the equipment, it is suggested to use shielded grounded cables with in-line filters if necessary. CAUTION The product described herein is equipped with a grounded plug for the user's safety. It is to be used in conjunction with a properly grounded receptacle to avoid electrical shock. iii iv Preface This publication describes the various units of the IBM Personal Computer XT and IBM Portable Personal Computer; and the interaction of each. The information in this publication is for reference, and is intended for hardware and program designers, programmers, engineers, and anyone else with a knowledge of electronics and/ or programming who needs to understand the design and operation of the IBM Personal Computer XT or IBM Portable Personal Computer. This publication consists of two parts: a system manual and an options and adapters manual. The system manual is divided into the following sections: Section 1, "System Board," discusses the component layout, circuitry, and function of the system board. Section 2, "Coprocessor," describes the Intel 8087 coprocessor and provides programming and hardware interface information. Section 3, "Power Supply," provides electrical input/output specifications as well as theory of operation for both the IBM Personal Computer XT power supply and the IBM Portable Personal Computer power supply. Section 4, "Keyboard," discusses the hardware make up, function, and layouts of the IBM Personal Computer XT and the IBM Portable Personal Computer keyboards. Section 5, "System BIOS," describes the basic input/ output system and its use. This section also contains the software interrupt listing, a BIOS memory map, descriptions of vectors with special meanings, and a set of low memory maps. In addition, keyboard encoding and usage is discussed. v Section 6, "Instruction Set," provides a quick reference for the 8088 assembly instruction set. Section 7, "Characters, Keystrokes, and Colors," supplies the decimal and hexadecimal values for characters and text attributes. Section 8, "Communications,"describes communications hardware and discusses communications interface standards and the sequence of events to establish communications. A glossary, bibliography, and index are also provided. The Technical Reference options and adapters manual provides information, logic diagrams, and specifications pertaining to the options and adapters available for the IBM Personal Computer family of products. The manual is modular in format, with each module providing information about a specific option or adapter. Modules having a large amount of text contain individual indexes. The modules are grouped by type of device into the following categories: • Expansion Unit • Displays • Printers • Storage Devices • Memory Expansion • Adapters • Miscellaneous • Cables and Connectors Full page length hard tabs with the above category descriptions, sep~rate the groups of modules. vi The term" Technical Reference manual" in the option and adapter manual, refers to the IBM Personal Computer XT /IBM Portable Personal Computer Technical Reference system manual. The term "Guide to Operations manual" in the option and adapter manual, refers to either the IBM Personal Computer XT Guide to Operations manual or the IBM Portable Personal Computer Guide to Operations manual. vii Prerequisite Publications • IBM Personal Computer XT Guide to Operations • IBM Portable Personal Computer Guide to Operations Suggested Reading • BASIC for the IBM Personal Computer • Disk Operating System (DOS), Version 2.1 • IBM Personal Computer XT Hardware Maintenance and Service • IBM Portable Personal Computer Hardware Maintenance and Service • MACRO Assembler for the IBM Personal Computer viii Contents SECTION 1. SYSTEM BOARD ..................... 1-1 Description .................................. 1-3 Microprocessor ............................... 1-4 Data Flow Diagrams ........................... 1-5 System Memory Map .......................... 1-8 System Timers .............................. 1-10 System Interrupts ............................ 1-10 ROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-12 RAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-12 DMA ..................................... 1-12 I/O Channel ................................ 1-13 System Board Diagram ........................ 1-15 I/O Channel Diagram ......... . . . . . . . . . . . . . . .. 1-16 I/O Channel Description ...................... 1-18 I/O Address Map ............................ 1-21 Other Circuits ............................... 1-23 Speaker Circuit .......................... 1-23 8255A I/O Bit Map ...................... 1-25 System-Board Switch Settings .............. 1-27 Specifications ............................... 1-28 Card Specifications ....................... 1-28 Logic Diagrams .............................. 1-30 SECTION 2. COPROCESSOR ..................... 2-1 Description .................................. 2-3 Programming Interface ......................... 2-3 Hardware Interface ............................ 2-4 SECTION 3. POWER SUPPLY ..................... 3-1 IBM Personal Computer XT Power Supply ......... 3-3 Description .............................. 3-3 Input Requirements ....................... 3-3 Outputs ................................. 3-4 Overvoltage/Overcurrent Protection .......... 3-5 Power-Good ............................. 3-5 Connector Specifications and Pin Assignments .. 3-5 IBM Portable Personal Computer Power Supply ..... 3-7 ix

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