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KTD-S0005-0
6
ISA Bus Expansion
The design of the MOPSlcdLX follows the standard PC/104 form factor and offers ISA bus signals for the use
of standard PC/104 adapter cards.
The PC/104 bus consists of two connectors that use 104 pins in total.
XT bus connector (64 pins)
®
AT bus connector (40 pins, which is optional for 16 bit data bus system)
®
The pinout of the PC/104 bus connectors corresponds to the pinout of the ISA bus connectors with some
added ground pins. The two PC systems with different form factors are electrically compatible.
The XT bus connector, row A and B.
The corresponding 64 pin stackthrough header (ISA bus = 62 pins) has two added ground pins at the end of
the connector (pin A32 and pin B32). The pinout between PC/104 bus and XT ISA bus is identical between
A1 - A31 and B1 - B31.
The AT bus extension connector, row C and D
The corresponding 40 pin stackthrough header (ISA bus = 36 pins) has four added ground pins, two on
each side of the connector. To avoid confusion the first two pins are defined as pin C0 and pin D0. The
additional ground pins at the end of the connector are defined as C19 and D19. The pinout between PC/104
bus and AT ISA bus is identical between C1 - C18 and D1 - D18.
6.1
Connector
The MOPSlcdLX features both – XT bus and AT bus extension – on two dual-row socket connectors with 2.54
mm x 2.54 mm grid (0.1" x 0.1").
The PC/104 XT bus is available through the X10000A connector. The PC/104 AT bus is available through the
X10000B connector.
6.2
Hints
PC/104 adapter cards are mounted in a stack-through manner. Adapter cards are designed with plugs on
their undersides that mate with the PC/104 socket connectors of MOPSlcdLX. PC/104 adapters can support
the socket connector version on their topside and allow additional stacking of adapters.
Whenever possible use the MOPSlcdLX as top module of the PC/104 stack as the CPU board is normally the
board with the highest heat dissipation.
Page 12
MOPSlcdLX User's Guide
ISA Bus Expansion
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