Special math functions <author>Christian Krüger <abstract> This library provides functions for speed optimized math operations. </abstract> <!-- Table of contents --> <toc> <!-- Begin the document --> <sect>Multiplication<p> When accessing screen memory often a multiplication of the vertical position is needed to calculate the target address. A quite common horizontal span for 8-bit systems is 20 or 40 bytes (beside e.g. 32 bytes, where the multiplication can be accomplished by shifting 5 times). <p> <tscreen><verb> unsigned int __fastcall__ mul20(unsigned char value); </verb></tscreen> The 8 bit <tt>value</tt> is multiplied by 20 and returned as 16 bit value. </p> <p> <tscreen><verb> unsigned int __fastcall__ mul40(unsigned char value); </verb></tscreen> The 8 bit <tt>value</tt> is multiplied by 40 and returned as 16 bit value. </p> </article>