Video enhancement for Acorn Archimedes

The Acorn Archimdes, well-known far its speed and good graphics facilities, has a video interface that allows programmers to design a variety of screen modes with the aid ofa programmablecontroller. As so often, this versatility has a draw-back: since the controller uses a fixed clock of 24 MHz, the frame frequency decreases the more pixels areused in the screen image. As a result, high-resolution screen modes have a tendency to cause flicker.Fortunately this drawback may be eliminated or nearly so by increasing the dock to 36 MHz: this has already been incorporated in the new A540 computers.