[comp.sys.amiga.programmer] Blitter initialize cost

booth@ccad.uiowa.edu (Michael Booth) (02/22/91)

I have some code which two dimensionally scrolls a large gaming area
in a small window. To do this, I have things defined as 16x16 pixel 'cells'
and I use the blitter to recreate the entire screen each frame. This is
done by blitting in a matrix of these small 'cells' to create a larger
image. 

My question is: would it be much more efficient to have the blitter
blit the ENTIRE small screen over, and fill the newly exposed area with 
cells? Or is the blitter initialization time small enough I should leave
the screen update as it is, blitting small chunks of imagery many times?

Secondary question: Does anyone know how to make CIA-A send an acknowledge
back to the keyboard? 

Thanks,

Mike Booth