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The 44474A Digital I/O module provides 16 bi-directional
data lines (bits) plus 4 lines used for control and handshaking. All
lines are TTL compatible. The 16 data lines offer TTL compatible input
and open collector output. The 16 I/O lines or bits can be addressed
individually (bit-by-bit), or as two independent 8-bit ports, or as
one 16-bit word. For instance, one port can be used for output operation,
while the other for input. Each I/O line can sink current up to 0.125A
from external devices.
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