The Nascom-1 and Nascom-2 computers came without power supplies. Goodness knows how they expected us to use them! Of course, many users (especially constructors) simply provided their own power supplies – saving their money for more meaningful upgrades!

The original power supply for the Nascom-1 is quite rare now. This version had quite severe overheating problems with the 5v regulator and was soon replaced.

.(Photos courtesy of Richard at 80bus.co.uk)

nascom1_psu

The new 3A power supply became the standard for both the Nascom-1 and Nascom-2.. This was basically the same as the original, but with much better cooling, as can be seen by the sizes of the heatsinks.

3apsu

The links below lead to PDF files of the user manuals.

Nascom 3A PSU

Both of the 3A supplies consisted of a PCB with an off-board mains transformer. The 3A PSU was intended to power a Nascom-1, buffer board and a memory card – and not much else.

Nascom 8A PSU

The 8A PSU was designed to fit into one end of a 19″ rack. It was a much better device altogether, even having fuse and crowbar protection for the 5V supply. It consisted of an aluminium housing (also used as the heatsink), containing the PCB and mains transformer. There were connectors on the front for the mains supply and for connection of the low voltage supplies.


Nascom Pages