CGA2.COM is a colour-graphics emulator for those who have Hercules boards 
instead of the Colour Graphics adaptor.

In many cases it allows you to run programs that would otherwise require a CGA 
board.

Before running the application program, simply type CGA2 and the utility will 
sit in the back of memory and intercept calls, so that the computer will 
"think" a CGA board is in place. It's been widely tested and works on a wide 
range of computers and Hercules-type boards. Chances are good that it will work 
on yours. 

To remove CGA2 just reset your computer.