Chapter
2
COPROCESSOR
HARDWARE
Introduction
The
Copper
is
a general purpose coprocessor
that
resides
in
one of the Amiga's custom
chips.
It
retrieves its instructions via direct memory access (DMA).
The
Copper can
control nearly the entire graphics system, freeing the 68000
to
execute program
logic;
it
can also directly affect the contents of most of the chip control registers.
It
is a very
powerful tool for directing mid-screen modifications in graphics displays and for directing
the register changes
that
must occur during the vertical blanking periods. Among other
things,
it
can control register updates, reposition sprites, change the color palette,
update the audio channels, and control the blitter.
Coprocessor Hardware 7
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