Brian,
Are you using an 8051 or similar micro for this display task ?
If so, is there a reason you are using a CRT for your display ? i.e. size, brightness, or existing hardware.
If you have some flexibility you could look into the LCD or VFD graphic modules. These are much less demanding.
If you must use a CRT you need to decide on the interface standard. i.e. composite video, NTSC video, RGB, VGA ect.
The rastorization of a CRT image is going to give your micro a real workout. There may not be any time available for your micro do decide what needs to be displayed. You may want to build a dedicated controller for the rasterization function.

It seems I have given you more questions than answers. I hope this in some small way has helped.

Thank you for your service to the country.

Bob