I'm getting a Colecovision soon, without a power supply. These things are a nightmare, as you know - they have an obsolete plug and also supply the unit with +5, +12 and -5v dc.
My question is this -
Can the Colecovision be modded to a common 2.1mm barrel plug to take a 12vdc supply - powering a 7905 -5v reg and a 7805 +5v reg?
Thus, giving the machine it's 12v, 5v and -5v supplies?
I would also use some big custom heat sinks or Traco switching voltage regulators to keep the heat down inside the machine.