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3D model for ATX to AT/XT/Amiga power supply adapter

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ATnoX

Introduction

The ATnoX was born out of the necessity for me to have a small adapter adapter I could use to fit AT/XT motherboards into modern cases, powering them with ATX power supplies and turning them on with a momentary switch (the standard power on button present in computer cases built in the last 20+ years).

The ATX2AT is a wonderful device (I own several of them), but I prefer to use it to test my boards and then fall back onto a cheaper alternative I can close inside a case without it feeling like a waste.

In fact, the output connector uses the same pinout as the ATX2AT, but as I still had a free pin available, I decided to include a TICK generator: a 50/60hz square wave signal required by some big-box Amigas to turn on.

Rev. 3.2 PCB

Pinout

14 pin connector, front view.

                ____
.----.----.----|----|----.----.----.
| 14 | 13 | 12 | 11 | 10 |  9 |  8 |
|----+----+----+----+----+----+----|
|  7 |  6 |  5 |  4 |  3 |  2 |  1 |
'----'----'----'----'----'----'----'
  1. +12V
  2. +5V
  3. +5V
  4. GND
  5. GND
  6. TICK (50/60Hz depending on X1)
  7. -5V
  8. +12V
  9. +5V
  10. +5V
  11. GND
  12. GND
  13. Power OK signal
  14. -12V

Component list

TODO

Features

  • -5v onboard generation via a 7905 regulator
  • Momentary button power-on support
  • Header for power led in case the motherboard lacks it
  • Power on button included on board for bench testing
  • Optional amiga Tick generator
  • 4 Layer board (middle layers are +5v and GND)

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3D model for ATX to AT/XT/Amiga power supply adapter

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