IBM 3278 User Manual

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Personal Computer
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IBM Personal Compu ter
3278/79 Emulation
Adapter Technical .
Reference
1502336

IBM 3278 Specifications

General

Category	Desktop
Manufacturer	IBM
Model	3278
Display Type	CRT
Display Colors	Monochrome
Display Size	12 inch, 14 inch (Model dependent)
Connectivity	Coaxial cable

Summary

Preface

Section 1 IBM Personal Computer 3278/79 Emulation Adapter

Introduction

Provides an overview of the IBM Personal Computer 3278/79 Emulation Adapter's function and connectivity.

Adapter Block Diagram

Illustrates the internal components and data flow of the emulation adapter.

I/O Address Locations

Details the I/O addresses used by registers to define and control the emulation adapter.

Interrupt/Status Register (2D0)

Describes the 8-bit register for interrupt and status bits managed by the adapter and PC.

Visual/Sound Register (2D1)

Explains the 8-bit register controlling visual features and sound alarms for emulation.

Cursor Address Register (2D2, 2D3)

Details the 16-bit register used for cursor location and I/O address counting.

Control Register (2D4)

Defines the 8-bit read/write register for controlling adapter functions like coaxial enable.

Scan Code Register (2D5)

Describes the 8-bit register for sending keystroke codes to the control unit.

Terminal ID Register (2D6)

Details the 8-bit register for setting the terminal identifier before link enablement.

Memory Address Locations

Outlines the 8KB RAM reserved for the adapter, including base and ending addresses.

Accepted Commands

Lists commands sent from the control unit and recognized by the emulation adapter.