COMPAQ DeskPro 386 Reference Manuals

So far, I’ve found only the first volume of the COMPAQ DeskPro 386/25 Technical Reference Guide:

The table of contents in Volume I gives us a taste of what’s in Volume II:

  • Chapter 5 KEYBOARD
  • Chapter 6 POWER SUPPLY
  • Chapter 7 MULTIPURPOSE FIXED DISK DRIVE CONTROLLER BOARDS
  • Chapter 8 DISKETTE DRIVES
  • Chapter 9 FIXED DISK DRIVE SYSTEMS
  • Chapter 10 FIXED DISK DRIVE BACKUP SYSTEMS
  • Chapter 11 VIDEO DISPLAY CONTROLLER BOARDS
  • Chapter 12 MONITORS
  • Chapter 13 ASYNCHRONOUS COMMUNICATIONS/PARALLEL PRINTER BOARD
  • Chapter 14 COMPAQ 300-/600-MEGABYTE FIXED DISK DRIVE EXPANSION UNIT
  • Appendix A INTERNATIONAL KEYBOARDS
  • Appendix B ERROR MESSAGES

COMPAQ DeskPro 386/25 Technical Reference Guide (Volume I)

NOTE: As the page on COMPAQ DeskPro 386 ROMs explains, 5 COMPAQ engineers had their initials “engraved” in the original DeskPro 386 ROM. In June 2018, I was fortunate enough to meet 4 of them, and they were all kind enough to sign my copy of the DeskPro 386 Technical Reference Guide. This “signature page”, shown below, has since been added to the PDF above.

COMPAQ DeskPro 386-25 Technical Reference Guide - Volume 1 - 1988-08 - Signatures

COMPAQ DeskPro 386 Reference Highlights

Fixed Disk Drive Parameter Table Values

The following table comes from pages 4-189 and 4-190 of the DeskPro 386/25 Technical Reference Guide (Volume I).

                                             Landing
                                 Pre-comp.    Zone
Drive                    Max.    Cylinder    Cylinder   Sectors/   Capacity     Same as
Type         Cylinders   Heads   (note 1)    (note 2)    Track       (MB)       IBM PC AT
-----------------------------------------------------------------------------------------
  1 (note 3)    306       4        128         305        17        10.65       yes
  2 (note 3)    615       4        128         638        17        21.41       yes
  3             615       6        128         615        17        32.12       yes
  4            1024       8        512        1023        17        71.30
  5             940       6        512         939        17        49.09       yes
  6 (note 3)    697       5        128         696        17        30.33
  7             462       8        256         511        17        32.17       yes
  8             925       5        128         924        17        40.26
  9             900      15         -1         899        17       117.50       yes
 10             980       5         -1         980        17        42.65
 11             925       7        128         924        17        56.36
 12 (note 3)    925       9        128         924        17        72.46
 13             612       8        256         611        17        42.61
 14             980       4        128         980        17        34.12
 15     Reserved - Not for use by end-users
 16             612       4          0         612        17        21.31
 17             980       5        128         980        17        42.65
 18             966       6        128         966        17        50.45
 19            1023       8         -1        1023        17        71.23
 20             733       5        256         732        17        31.90
 21             733       7        256         732        17        44.66
 22             524       4         -1         524        40        42.93
 23             924       8         -1         924        17        64.34
 24             966      14         -1         966        17       117.71
 25 (note 3)    966      16         -1         966        17       134.53
 26            1023      14         -1        1023        17       124.66
 27             832       6         -1         832        33        84.34
 28            1222      15         -1        1222        34       319.09
 29            1240       7         -1        1240        34       151.10
 30             615       4        128         615        25        31.49
 31             615       8        128         615        25        62.98
 32             905       9        128         905        25       104.26
 33 (note 3)    832       8         -1         832        33       112.46
 34             966       7         -1         966        34       117.71
 35 (note 3)    966       8         -1         966        34       134.53
 36             966       9         -1         966        34       151.35
 37             966       5         -1         966        34        84.08
 38 (note 3)    611      16         -1         611        63       315.33
 39            1023      11         -1        1023        33       190.13
 40            1023      15         -1        1023        34       267.13
 41            1630      15         -1        1630        52       650.96
 42            1023      16         -1        1023        63       527.97
 43             805       4         -1         805        26        42.86
 44             805       2         -1         805        26        21.43
 45 (note 3)    748       8         -1         748        33       101.11
 46             748       6         -1         748        33        75.83
 47 (note 3)    966       5        128         966        25        61.82
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NOTES: 1.  A value of -1 means that no write precompensation is used.
       2.  These values are not used by the COMPAQ DESKPRO 386/25 system, which
           automatically retracts and locks the heads in a non-data landing zone
           at power-down.
       3.  Drive types supported by Compaq.
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