HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

       unsigned far imagesize(int left, int top, int right, int bottom)

       - prototype in graphics.h

       - returns the size of the buffer required to hold the screen image
         represented by the coordinates
       - returns size or 0xFFFF on error (image >= 64K-1)

Esc or Alt-X to exit imagesize Home/PgUp/PgDn/End ←↑↓→
Converted to HTML in 2006 by Timo Bingmann