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Apple I User Manual

Apple I
15 pages
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Apple I Specifications

General IconGeneral
ProcessorMOS Technology 6502
Clock Speed1 MHz
OutputComposite video
RAM4 KB (expandable to 8 KB or 48 KB)
StorageNone (Cassette interface for storage available separately)
Graphics40x24 characters
InputKeyboard (ASCII)
DisplayNone (required external display)
Operating SystemNone (required manual programming)
Release DateApril 1976
PortsKeyboard, cassette interface
Power SupplyExternal power supply required

Summary

Specifications

Microprocessor and Video Specifications

Details microprocessor clock frequency, video output format, and display memory.

RAM and Power Supply Specifications

Information on on-board RAM capacity and input power requirements.

Introduction

System Overview and Manual Structure

Describes the Apple Computer system and outlines the manual's three main sections.

Section I: Getting the System Running

Keyboard Connection and Interface

Instructions for connecting an ASCII keyboard and its interface to the system.

Display and AC Power Requirements

Details on connecting the display and the required AC power sources and transformers.

System Test Program

Procedure for running a test program to verify system functionality after setup.

Section II: Using the System Monitor

Monitor Operation and Basic Commands

Explains monitor entry, line editing, and basic commands for memory examination.

Memory Block Commands

Details commands for examining successive memory locations and blocks.

Data Deposit Commands

Explains commands for depositing data into single and successive memory locations.

Program Execution Commands

Details commands for running programs at specified addresses or the last examined location.

Hex Monitor Listing Commands

Describes commands related to hex data handling, like NTHEX and DIG.

Monitor Utility Routines

Lists useful monitor routines like GETLINE, ECHO, PRBYTE, and PRHEX.

Advanced Monitor Commands

Covers commands for examining blocks and depositing data, including specific syntax.

Monitor Command Notes

Provides notes on RAM locations used by the monitor and invalid for user use.

Hardware Notes

Page Variables and Other Variables

Lists internal variables used by the monitor and other system variables.

KBD/DSP Interface Diagram

Illustrates the interface between the keyboard/display and the system via the PIA.

Section III: How to Expand the Apple System

System Expansion Overview

Describes expansion via the 44-pin edge connector for memory and I/O devices.

Memory Refresh and DMA

Explains memory refresh cycles and the DMA capability of the system.

Software Considerations for Expansion

Lists routines for keyboard input and display output relevant to expansion.

Warranty Information

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