File:Radio Shack TRS-80 Micro Computer Technical Reference Handbook (2nd edition, 1982).pdf

Radio Shack (a division of Tandy Corporation), TRS-80 Micro Computer Technical Reference Handbook, second edition, second printing, 1982. The service reference for the TRS-80 Model I logic board (PCB 1700069): system block diagram and memory map (pp. 9-13), theory of operation covering the CPU, system RAM, video, keyboard, cassette port, power supply (pp. 52-54) and Level I/Level II ROMs (pp. 14-56), adjustments and troubleshooting including the power-supply checks (p. 60) and the regulator pin-voltage table, Figure 19 (p. 75), the expansion port (pp. 83-91), the Level I logic board, keyboard and RAM/ROM kit parts lists (pp. 93-97), notes on the A, D and later board versions and their ROM types (pp. 99-110) and the master schematic. 116 PDF pages; the scan's searchable text layer is the archive.org OCR and contains recognition errors. Described on Radio Shack TRS-80 Micro Computer Technical Reference Handbook.

Cited from Tandy TRS 80.

https://archive.org/details/TRS-80_Micro_Computer_Technical_Reference_Handbook_2nd_Edition_1982_Radio_Shack (text PDF, retrieved 2026-10-01). The 1978 first edition is at https://archive.org/details/TRS-80_Micro_Computer_Technical_Reference_Handbook_1st_Edition_1978_Radio_Shack

Radio Shack, a division of Tandy Corporation, Fort Worth, Texas.

Copyright 1982 Radio Shack. Not freely licensed. Hosted for preservation and repair reference.