`RasterIRQ`

Systems: BBCM, ACORN, ATARI800
Parameters: p

Sets up the raster irq to trigger a user-defined interrupt (procedure) at a given raster line. Example:


RasterIRQ(myRaster(), 25, 1); // Assign myRaster with kernel (1) to fire at rasterline 25
..
procedure myRaster();
begin
     startirq(1); // start IRQ with kernal=1
     ...
    closeirq();
end();