I just recognized that the coleco vision power supply repro adapter is identical to the ti 99/4a power connector.
A 18v ac power supply may not be the problem to as many printers exactly use that voltage.
So is there a demand for such an adapter for ti 99/4a?
after there seems no demand for replacement power connectors I will create a few coleco/TI99 dual usage connectors. sadly to say that TI fan base seems to be low....