This SWI is used to set up the Zap redraw block initially. It puts the value
0 in r_screen so the actual screen address is used when ZapRedraw_RedrawArea is called (this can change quite often) and fills in r_bpl, r_bpp, r_magx, r_magy, r_xsize, r_ysize by using the call OS_ReadVduVariables. It also fills in r_mode by
using OS_Byte 135. This call should be made after any mode
change. Compensation is made for double pixel modes by decreasing r_magx. A
pixel in Zap means a hardware pixel rather than an emulated double pixel. [sh-index] Back to list of manuals
