Atari XF551 Documentation

The Atari XF551 documentation below comprises Atari's schematic of the Atari XF551 controller board and power supply, and the owner's manual packed with the drive.

Schematic Diagram XF551 (FCC)

The Schematic Diagram XF551 (FCC) is Atari (Japan) Corporation's drawing C100727, revision 1, sheet 1 of 2. It is stamped "Preliminary Release" and dated 19 November 1987; the title block gives the next assembly as CA200107. The hosted PDF has two pages, the left and right halves of sheet 1.

Contents

• Left half: the SIO connectors J2 and J3 with the data, command and data-in circuits (Q1 to Q3, U3); drive select switch S2 and its table; microcontroller U1 (8040, with the 8040/8050 jumper on pin 7); disk controller U2 (WD1772-02); reset capacitor C113; the power input J1 and switch S1.
• Right half: the 34-way drive interface J4 and its signals; the 8.333 MHz oscillator; the power supply (L1, bridge D1, voltage doubler C102, D2 and D3, regulators Q5 and Q6 (7812) with their capacitors) and the drive power connector J5; the title block.

What this schematic does not contain

• Sheet 2, which is not in the scan. Sheet 1 sends the data bus to U5 and the address and chip-enable lines to U6, neither of which is drawn on it; Gramblička identifies the firmware chip U6 as a 2764 EPROM and the board as also carrying a 74LS373 latch.
• Any part of the drive mechanism's own electronics.
• A parts list. The values are written on the drawing.
• Board-version changes. Igor Gramblička reports a 1988 board with a different power supply and 74LS14 wiring, and points out that the jumper labels on pin 7 of U1 are wrong.

Pages that cite this schematic

• Atari XF551: hardware and power supply
• Atari XF551 Capacitor Replacement Guide: the electrolytic capacitor list
• Atari XF551 Drive Troubleshooting: supply points and voltages
• Atari XF551 Maintenance Guide: J5 voltage checks

Download: Atari XF551 Schematic C100727.pdf

Atari DOS 2.5: XF551 Disk Drive Owner's Manual

The Atari DOS 2.5: XF551 Disk Drive Owner's Manual is Atari Corporation's manual for early XF551s, part number C033537-001 (also printed C033537-0A1), © 1987, printed in Taiwan. The hosted scan has 164 pages including the covers. Drives sold from January 1989 came with DOS XE and a different manual.

Contents

Section	Pages
Your Atari XF551 disk drive and DOS	v–vii
Section 1: Your Atari XF551 disk drive (connecting, more than one drive, drive select switches, care of diskettes)	1–5
Section 2: Getting started with DOS 2.5 (loading DOS, boot errors, menu, directory, duplicating, formatting, files)	7–27
Section 3: Selecting a DOS menu option (A to P)	29–62
Section 4: Using BASIC commands with DOS 2.5	63–80
Appendix A: BASIC reserved words used with disk operations	83
Appendix B: Notations and terminology	87
Appendix C: Error messages and how to recover	91
Appendix D: DOS 2.5 memory map for a 64K system	101
Appendix E: Hexadecimal to decimal conversion	103
Appendix F: Speeding up data transfers	105
Appendix G: Telling DOS how many drives you have	107
Appendix H: DOS 2.5 with an 810 or with DOS 2.0S files	111
Appendix I: Structure of a compound binary file	117
Appendix J: Glossary	119
Appendix K: DOS 2.5 and the 130XE RAM disk	125
Appendix L: DOS 2.5 disk utilities	129
Appendix M: XF551 specifications	141
Appendix N: Power connection in the United Kingdom	143
Index; customer support	145–149

What this manual does not contain

• Any description of the XF551's double-density or double-sided modes; DOS 2.5 uses only the 810 and 1050 formats.
• Service information.
• A correct processor entry. Appendix M gives a 6507 microprocessor and a 127K dual-density format, which belong to the 1050; Atari's schematic shows an 8040.

Pages that cite this manual

• Atari XF551: dimensions and weight
• Atari XF551 Maintenance Guide: connecting and care of diskettes
• Atari XF551 Drive Troubleshooting: boot errors and error codes

Download: Atari DOS 2.5 XF551 Disk Drive Owner's Manual C033537.pdf