Radio Shack TRS-80 Model 100 Service Manual
The Radio Shack Service Manual: TRS-80 Model 100 Portable Computer covers catalogue numbers 26-3801 and 26-3802, the 8 KB and 24 KB versions of the TRS-80 Model 100. It was custom manufactured for Radio Shack, a division of Tandy Corporation, and printed in Japan; the copy here carries no date or manual part number. The scan has 144 pages and an OCR text layer.
Contents
[edit | edit source]With the printed page numbers from the manual's own contents list:
- Section I, Introduction: general description, specifications (p. 1-4), connectors, switches and the contrast control (p. 1-6)
- Section II, Disassembly and reassembly (pp. 2-1, 2-2)
- Section III, Preventive maintenance: adjustment, cleaning of the body and LCD, modem transmit level adjustment (p. 3-1)
- Section IV, Theory of operation (pp. 4-1 to 4-34): CPU, memory, address decoding and bank selection, memory and I/O maps, keyboard, cassette, printer, bar code reader, buzzer, system bus, LCD interface, clock, serial interface and modem, the LCD itself, the power supply and automatic power-off circuit (p. 4-32) and the reset circuit (p. 4-34)
- Section V, Troubleshooting: how to use the section (p. 5-1), troubleshooting guide flowcharts (p. 5-2), check list (p. 5-12)
- Section VI, Exploded view (p. 6-1) and parts list (p. 6-3)
- Section VII, Diagrams: schematic diagrams of the main and LCD boards (p. 7-1) and board views (p. 7-3)
- Appendix A, Installation of optional RAMs and ROM
- Appendix B, Character code table
- Appendix C, LSI descriptions: MSM80C85ARS CPU, MSM81C55RS PIO, IM6402 UART, µPD1990AC timer, MC14412 modem, TC5518BF-25 RAM and LH-535618 ROM
What this manual does not contain
[edit | edit source]The parts lists give values, tolerances and Radio Shack part numbers but not the temperature ratings of the electrolytic capacitors. The troubleshooting section is a set of flowcharts naming the parts to check for each fault; it gives few test-point voltages beyond the supply rails, the reset levels and the clock frequencies. The manual does not cover the later Tandy 102 or Tandy 200.
Pages that cite this document
[edit | edit source]- TRS-80 Model 100: specifications, boards, power supply, memory battery part number
- TRS-80 Model 100 General Maintenance: disassembly, cleaning, modem level adjustment, optional RAM and ROM, check list
- TRS-80 Model 100 Troubleshooting Guide: the troubleshooting flowcharts and check list
- TRS-80 Model 100 Capacitor Replacement Guide: the electrolytic capacitor values from pp. 6-3 and 6-4
Download: Radio Shack TRS-80 Model 100 Service Manual (26-3801, 26-3802).pdf