User guide

As the Mouse is moved it generates hardware interrupts. These interrupts are used

by the ROM to update various counters. These counters are used in two modes:

1. The counters are used to hold x,y co-ordinates in the range (0-1279,0-1023

which are compatible with the graphics co-ordinate system, i.e. 0,0 is in the

bottom left corner. These co-ordinates are used by the POINTER routines, and

can be read using OSWORD 64.

Fig. 3: Example of *WINDOW and *ICON comman