An introduction to small Digital Equipment Csorporation systems for the hobbyist
by Ákos Varga (Hamster)

Table of contents

1  Qbus basics
1.1  The history of the qbus
1.2  The functionality of the qbus
1.2.1  Physical functions
1.2.2  Addressing basics
1.3  Qbus card types
1.4  Qbus backplane types
1.4.1  2 by X backplanes
1.4.2  4 by X backplanes  "Serpentine" configuration  QBUS/CD configuration  Mixed configuration backplanes
1.5  Qbus hints and tips
1.5.1  Device ordering
1.5.2  Working in qbus enclosures

2 Qbus systems
2.1  Introduction
2.2 LSI-11 and MicroPDP-11 systems
2.2.1  LSI-11 and LSI-11/2
2.2.2  LSI-11/23 and MicroPDP-11/23
2.2.3  Qbus systems based on the DCJ11 chip  LSI-11/73  PDP-11/53  PDP-11/83  PDP-11/93
2.3  MicroVAX and VAX systems
2.3.1  MicroVAX I, VAXstation I
2.3.2  MicroVAX II, VAXstation II, VAXstation II/GPX
2.3.3  MicroVAX III  MicroVAX 3500, MicroVAX 3600, VAXstation 3200  MicroVAX 3800, MicroVAX 3900  MicroVAX 3300, MicroVAX 3400
2.3.4  VAX 4000/200
2.3.5  VAX 4000/300
2.3.6  VAX 4000/400
2.3.7  VAX 4000/500

3  Qbus modules
3.1  Introduction, warnings
3.2  Qbus system components, options
3.2.1  Processor  LSI-11 and MicroPDP-11  MicroVAX and VAX  Miscellanous
3.2.2  Memory
3.2.3  Mass storage controllers
3.2.4  Communication controllers
3.2.5  Data acquisition
3.2.6  Bus equipment
3.2.7  Video

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Note: These pages are for informational purposes, I cannot be held responsible for damages, loss of information/hardware or injuries. Take precautions, we're talking about sensitive equipment and electricity here! I gathered the information from handbooks, catalogs, UseNet postings and from my own experience, so I might be wrong here and there. Please mail me, if you find something that doesn't seem right!

Copyrights: Ákos Varga, 1999 Last modified: