The PCL-720+ and PCI-1735U digital I/O and counter cards are
PC-compatible add-on cards with 32 digital input channels, 32 digital
output channels and three programmable counter/timer channels. Their
digital I/O channels are TTL-compatible and use 74LS244 driver/buffer
circuits to provide high output driving capacity. These buffered
circuits also require lower input loading current than regular TTL
circuits. The cards' 8254 programmable counter/timer provides three
flexible 16-bit counter/timer channels. You can generate waves and
pulses by programming the 8254. Jumper settings determine the clock
crystal frequency. The cards also includes a breadboard area perfect
for customized circuits.
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