is it possible to rebuild old c64 hardware enhancements?

Fri Mar 6 12:45:45 CST 2009

> Wonder when someone will start hacking DTV set-top boxes to do scan
> conversion?  I noticed that one I bought (with coupon) had an RS-232
> port on the back.  Hooked up a terminal set 9600-n-8-1 and darned if
> I didn't get a register display and command prompt!
> I don't recognize the OS however.

    It is something proprietary. All boxes with the StI5518 chip shares more 
or less the same software.