Duo mainboard upgrades aside: Power Express

[Grizzlygiant]

Gregg Eshelman wrote:
> 
> I've read that the Duo 2300 mainboard supported all
> previous Duo LCD screens because it was also available
> as a (factory installed) upgrade.
> Etc.
> 
> They're no Power Express (I sooo WANT one of those!)
> but for Duos the ones like these can't be too
> common, eh?

Hello Gregg, et al.:

I'm very curious to find out what a Power Express is, if you wouldn't
mind sharing with me (and other unknown friends) enough detail to
satisfy my curiosity (and any further amount of detail would be
gratefully appreciated).

Sincerely yours, Grizzlygiant