Osi network refaras model

The problem with 24-bit colours is that is  uses a great  deal of video  memory and processing  power.  Some manufacturers  are of the  opinion that it is  so demanding  that it can really only  be  property supported on the  MCA or  EISA bus. Fortunately it is only needed  for applications  such us full  process colours DTP or  illustration.

There are many different types of  intelligent  graphics adapters, but most are  based on either IMB ’s  8514/A design or  TIGA from  Taxes  instruments. There are also  a great many graphics  “accelerator” which, while  they fail short  of being  intelligent graphics cards , have hardware  to specifically  speed up  particular operations common in GUI operating  systems  such as Windows. Indeed, these cards are so  specific  that they are  often called Windows  accelerators. The best known Windows  accelerators. The best known  Windows accelerator is IBM’s XGA.