Section
3.1
Designing Hardware for the Amiga Expansion
Architecture
INTRODUCTION
This section gives guidelines for designing hardware to reside on the
Amiga expansion bus. The Amiga expansion bus is a relatively
straightfonvard extension of the
68000
bus.
Hardware for the bus can be viewed as two categories: backplanes
and
PICs. Backplanes interface to the
86
pin connector of either
another backplane or the Amiga itself. Backplanes buffer the bus and
provide 100 pin connectors for
PlCs to plug into.
PIC
is
an acronym for plug-in card.
A
PIC
is
usually a card that plugs
into the standard 100 pin Amiga connectors.
A
sub-type
of
PIC is a combination of backplane and PIC integrated
into one package. These combination products should follow all of
the applicable backplane and PIC rules, especially auto-configuration.
Software never sees backplanes; all expansion hardware appears to
the software as
PICs.
WARNING
These specifications represent "worst case" design targets.
Products that do not comply with these specifications can be ex-
pected to fail on worst case production units.
Following conservative design
pracbces and allowing the widest
safety margins is your best assurance against problems in the
field.
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