Tandy TRS-80 Model 16

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Summary

TRS-80 Model 16 Technical Specifications

Processor Modules Overview

MC68000 CPU Board Details

128 K-256 K Memory Board Features

Z80 CPU Board Functionality

Floppy Disk Controller and Printer Interface

64 K-byte Memory Board Configuration

Video and Keyboard Interface

8-Slot Motherboard Functionality

CRT Display Module Specifications

Floppy Disk Drive Information

System Power Supply Requirements

TRS-80 Model 16 Theory of Operation

Model 16 CPU Board Operational Theory

Breaks down the CPU board theory into major logical sections.

Central Processing Unit (CPU) Details

Details the MC68000 CPU chip, its data, address, and control lines.

Address Lines Interface

Explains how address lines interface with the bus and their control.

Memory Access Control Lines Explained

Details control lines like AS*, LDS*, UDS*, R/W*, and DTACK*.

Bus Arbitration Lines and Mastership

Explains bus arbitration signals (BR*, BG*, BGACK*) for mastership.

Interrupt Priority Lines Function

Describes interrupt priority lines (IPLØ*-IPL2*) and the interrupt controller.

Function Code Lines for Addressing

Explains function code lines (FCØ-FC2) for user space and interrupt decoding.

System Control Lines Functionality

Explains system control lines like CLK, RESET*, HALT*, and BERR*.

Interrupt Logic and Controller

Z80 to 68000 Memory Interface

Interrupt Inputs Table

Upper Address Latch (port ØDFH)

Transfer Control Latch (port ØDEH)

Control Outputs Details (port ØDEH)

Component Parts Lists

16-Bit CPU Board Subassembly Parts

Integrated Circuits Part Numbers

16-Bit CPU Board Main Assembly Parts

16-Bit, 128 K Memory Board Subassembly Parts

Schematics Diagrams

68000 CPU Board Schematic

Detailed circuit diagram for the 68000 CPU Board.

128 K-256 K Memory Board Schematic

Circuit diagram for the 128K-256K Memory Board.

Z80 CPU Board Schematic Diagram

Circuit diagram for the Z80 CPU Board.

Floppy Disk Board Schematic

Circuit diagram for the Floppy Disk Board.

Z80 Memory Board Schematic

Circuit diagram for the Z80 Memory Board.

Video Display Schematic

Circuit diagram for the video display unit, including horizontal and vertical output.