These are homemade power adapter for the TRS-80 Model T line of computers (and a few others)

This will allow you to power your Tandy Radio Shack Model 100, Model 102 or Model 200 with a standard USB power pack.
This also works on an Olivetti M10 or a Tandy CCR-82.

This is a step up converter to the proper DC voltage the Tandy expects; on the proper diameter barrel jack that is a tight fit. There is also a green status led and an over current protection (250mA max).

You only get the white USB power cable, not the battery packs, the computers, the USB powermeter or the multimeter that you see on the pictures. :-) 

These are built by a fellow Model-T afficionado, and all tested before shipping on my own M102 & M200.
You can use your computer either without AA batteries at all, or with batteries in it - in which case the unit is powered by USB as long as it is connected, and AA cells are used when you unplug.
Also be sure to clean and deoxidize your female barrel connector (Kontakt60, DeOxit, etc) for maximum reliability.

International Shipping with Belgian post : 

PS
If you're into Model T, also check my Centronics printer cable and my Tandy PC-2 USB cable :)