While the 4010 only has 3 slots in its "minibus", there is an optional
minibus extender described by the user's manual that can extend the
minibus to a total of 8 slots (adding 5 72-pin connectors).
One of the 3 standard slots is the interface card (20ma current loop
or RS-232). This is the obvious card to replace if you're doing a
custom interface hack.
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