Tandy 3000 Technical Reference Manual

Part of sheet 13 of the main logic board schematic, 8000265, from part 1 of the scan.

The Tandy 3000 Technical Reference Manual is Tandy Corporation's service and design reference for the Tandy 3000, catalogue number 25-4104. Its sections are dated November 1985. The wiki hosts a scan of the first eight of its fourteen sections in three files, taken from the Internet Archive's compressed copies of a 600 dpi scan made by a collector, who describes the scan as an ongoing project.

Contents

The manual's table of contents, with its printed page numbers:

1. Design Specifications, p. 3
2. Theory of Operation, p. 35
3. Keyboard, p. 103
4. 2 Meg Memory Board, p. 117
5. Serial/Parallel Board, p. 159
6. Floppy Disk Controller Board, p. 181
7. Floppy Disk Drive (High Density, 1.2 Meg), p. 215
8. Floppy Disk Drive (Low Density, 360K), p. 427
9. Floppy Disk Controller/Hard Disk Controller, p. 629
10. Hard Disk Drive, p. 657
11. Power Supply, p. 855
12. Diagnostics, p. 893
13. Devices, p. 979
14. Operating System (BIOS), p. 1283

Hosted files

Hosted parts of the scan

File	Pages	What it holds
Part 1	96	Title page, contents and foldout insertion guide; detail design specification (buses, memory map, I/O decode, real-time clock registers, keyboard control, AT bus signals); main logic board theory of operation with timing diagrams and section 6 on jumpers, the colour burst adjustment and RAM and ROM upgrades; main logic board, main assembly and chassis parts lists; the 14 sheets of main logic board schematic 8000265, board artwork and timing diagrams; keyboard theory, figures and parts list
Part 2	84	2 MB memory upgrade board (theory, timing, DIP switch settings, parts lists for revisions A and B, schematic 8000256, artwork); serial/parallel card (jumper settings, schematic, parts list, artwork); floppy disk controller (WD16C92 specification, jumpers, schematic, PAL equations, parts list)
Part 3	181	1.2 MB floppy drive section: Mitsubishi M4854-3S and MF504A-3, servo/logic board jumper settings, Mitsubishi schematics and logic manual, operation of the major components and standard specifications

What this manual does not contain

• The scan ends with section 7. The 360 KB drive, the combined floppy and hard disk controller (Western Digital WD1002-WA2), the hard disk drive, the power supply (circuit diagram AA13260), diagnostics, device data and BIOS sections are not hosted and are not in the Internet Archive item.
• The foldout guide lists a "Version 2" main logic board, schematic 8000267 in revisions A and B. Those sheets are not in the scan; the hosted schematic is 8000265 for the original board.
• The table of contents has no disassembly section, and the hosted parts contain no list of power-on error messages.
• It covers the original 8 MHz Tandy 3000. The 12 MHz Tandy 3000 (25-4002), the 3000 HL and the 3000 NL are not described.
• Section 7 notes that Mitsubishi's maintenance manual for the 1.2 MB drive was not available when the manual was printed.

Pages that cite this document

• Tandy 3000: specifications, board layout, power connector, clock and battery circuit
• Tandy 3000 General Maintenance: jumpers, colour burst adjustment, RAM upgrade, option card settings, battery connector
• Tandy 3000 Troubleshooting Guide: power connector pinout, reset and clock circuits, memory and floppy faults
• Tandy 3000 Capacitor Replacement Guide: capacitor values from the parts lists

Part 1

Download: Tandy 3000 Technical Reference Manual (25-4104), volume 1 part 1.pdf

Part 2

Download: Tandy 3000 Technical Reference Manual (25-4104), volume 1 part 2.pdf

Part 3

Download: Tandy 3000 Technical Reference Manual (25-4104), volume 1 part 3.pdf