Chapter 6
BLITTER HARDWARE
INTRODUCTION
The blitter is one of the two co-processors in the Amiga. Part of the Agnus chip, it is used
to copy rectangular blocks of memory around and to draw lines. When copying memory, it
is approximately twice as fast as the 68000, able to move almost four megabytes per
second. It can draw lines at almost a million pixels per second.
In block move mode, the blitter can perform any logical operation on up to three source
areas, it can shift up to two of the source areas by one to fifteen bits, it can fill outlined
shapes, and it can mask the first and last words of each raster row. In line mode, any
pattern can be imposed on a line, or the line can be drawn such that only one pixel per
horizontal line is set.
- Blitter Hardware 163 -
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