Part I. Introduction - Tandy 102 Service Manual

I. INTRODUCTION
This manual is prepared for the Tandy 102 technicians working in field or in repair centers. Users of
this manual should be acquainted with the 80C85A microprocessor, the 81 C55 PIO and the 6402
UART. If you need more detailed information, refer to Appendix C in this manual.
This manual consists of seven sections and three appendices:
Section I
This section provides general information on the Tandy 102 such as specifications, external
views and internal views.
Section II
This section describes the disassembly procedures.
Section III
This section describes the maintenance of the Tandy 102.
Section IV
This section describes the general theory of operation for the Tandy 102.
Section V
This section describes how to troubleshoot the Tandy 102.
Section VI
This section provides an exploded view and parts list of the Tandy 102.
Section VII
This section provides the schematics, PCB diagrams, and silkscreen views of the PCBs of the
Tandy 102.
Appendix A
This appendix provides instructions for installing the optional ROM and additional RAMs.
Appendix B
This appendix provides the character code table, keyboard layouts and connector pin
assignments.
Appendix C
This appendix provides the technical information of the 80C85A, 81 C55, 6402 and LCD.