Screen update speed of 8088 PC
cclist at sydex.com
Wed Mar 15 17:37:57 CST 2006
On 3/15/2006 at 5:12 PM Jim Leonard wrote:
>To get around this, you write to CGA RAM while the beam is *not*
>drawing, but retracing horizontally or vertically back to the next
>scanline or display cycle. You can transfer about 250 words during a
>vertical retrace and exactly one word during horizontal retrace, so
>that's 450 words per frame, so a snow-less full-screen update would take
>3 frames (20fps).
>The obvious goal is to not be in the position of having to update the
Maybe cheating a little, but:
Alternatively, you can install an EGA card running in CGA compatibility
mode. You can even double-buffer the thing (write to one bank while
displaying the other).
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