home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Stolen Data 3
/
Stolen Data 3.adf
/
MAG-TEXT
/
CODE2a
< prev
next >
Wrap
Text File
|
1989-01-01
|
882b
|
31 lines
Movem.l (a7)+,d0-d7/a1-a6
Blank Dcb.l 16,0
With experimentation you can find a
point at which both the blitter and the
processor require the same amount of
time to clear their respective areas of
the screen
2) Setting Blitter Nasty - When using
the blitter for plotting bobs, you
require the full 4 channels enabled.
This leaves almost no processor time
left over, and for reasonable sized
bobs it is unnecessary to wait for the
blitter to finish.
3) Format your sintables so that no
unnecessary calculation is performed,
for instance have a separate table for
the BLTCON0 and BLTCON1 register pair
which is already ORED with $fca0000
derived from the x coordinate. ( this
is for the case A-Mask B-Bob C-Screen )
4) Always use indirect addressing, as
it's considerably faster than absolute
addressing. Don't use Address Register