Specifications

2.6.2 Using Standard PC Bus Cards
There are several options available from Ampro which allow you to add expansion cards to
the Little
Board/pC system:
• StackPlane/PC Expansion Adapter -- a board having the identical dimensions and
mounting points as the Little Board/PC. This adapter converts a single short (8 inches
or less) PC add-on card to the Little Board form factor. The StackPlane/PC adapter
piggy-backs above or below the Little Board/PC and connects to the PC Expansion Bus
by means
of a short ribbon cable. Several StackPlane/PC adapter assemblies can be
stacked.
• MiniBackplane/PC -- two-slot PC bus passive backplane with PC bus header for cable
connection
to the PC Expansion Bus header on the Little Board/PC.
• PC Backplane Adapter -- small circuit card which plugs into one edgecard connector on
any PC bus passive backplane, and provides a PC bus header for cable connection to the
PC Expansion Bus header on the Little Board/PC.
• Cable-Mount Edgecard Sockets -- 62-pin edgecard connectors can be used to construct
a ribbon cable which can connect the Little Board/PC's
PC Expansion Bus directly to a
PC plug-in expansion card using ribbon cable only. The edgecard sockets are available
from
PCD Connectors
Winchester,
MA
[phone]
RF31-2582-5 (62-conductor edgecard socket)
Contact
an Ampro sales representative for further information on these optional bus expan-
sion products.
2.6.3 Expansion Bus Cable Considerations
Here are· several points regarding the use of the board's AT Expansion Bus:
• Cable Length -- Keep the ribbon cable used as short as possible. Expansion bus cables in
excess of
six inches can result in reduced system reliability. We recommend:
--
For cable lengths up to 6 inches, use a high quality ribbon cable, such as 3M part
number 3365/64 (64 conductor).
--
For cable lengths between 6 and U inches, use a high quality ribbon cable with ground
plane, such as 3M part number 3353/64 (64 conductor).
-- Cable lengths in excess
of U inches are not recommended.
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