calexand@castor.usc.edu (Craig Alexander) (01/12/89)
I have a simple question for any of you out there who is willing to answer. I have just purchased an IBM PS2 Model 30/286 machine with VGA graphics. My question is, If I purchase sotware which supports EGA graphics, will my VGA system output EGA or CGA graphics??? Thanks in advance... >==========================> >==== Craig Alexander ====> >=======================>
chasm@killer.DALLAS.TX.US (Charles Marslett) (01/13/89)
Virtually all EGA software will run perfectly on a VGA (the exceptions are limited to a few programs that are very much optimized for a special environment -- high speed graphics terminal emulation programs, for example). To a lesser extent, the same applies to running CGA software. The VGA has a bit in CRTC register 0x11 that is used to disable writes to several of the registers that CGA software often writes to... the effect is that often such non-EGA compatible software can be made to work much better on a VGA than on an EGA (as opposed to the autoswitching EGAs like ATI's that run in a real CGA mode when such software is invoked). Charles chasm@killer.dallas.tx.us