The Sands of Egypt has not been sold for years and will not be reissued. Therefore this patch is unlikely to be used for piracy; please don't. The purpose of the patch is to enable the program to run on a Coco emulator.

With the renewed interest in the Coco as an emulator system on a Windows PC, this is a common occurance. The copy protection scheme for Sands of Egypt will prevent the program from running on an emulator. I will leave to the reader to determine a method for installing the patch.

track    sector    byte    old    new
18   16    $1A $27 $26
22    5    $E4 $26 $27
23    8    $6D $26 $21

This image does not do justice to the view on a composite monitor where artifact color generation produces a much more interesting picture.

To see this image on an RGB monitor the program must be patched to change it from PMODE4 to PMODE3 graphics. You must use a disk editor to do the job. Also you must poke in the correct palette colors.

Change Track 23, Sector 4, byte $53 from $FF to $EF.
Each time you start the program run:
10 POKE&HFFB4,0:POKE&HFFB5,9:POKE&HFFB6,36:POKE&HFFB7,63

If red and blue are reversed, switch the 9 and 36 in the above line.