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Making a Display using LEDs and Parallel port

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nasirasim

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how to cascaded 74hc154

Hello. Actually I want to mack LED display board using Parallel port to control these LED . the quantity of LEDs may vary from 100+. I know how to control 8 LEDs by parallel port. but I want to know the teqnique to control more than 8 LEDs using parallel port. Pleasssssssssssssse help me. pleas give detail. thnaks
 

how to cascade 74hc154 to 74hc154

Cascade 3 level of 4 to 16 line decoder chips (74HC154)
viz

8 bit port to 2 x 74HC154
Take 16 outputs of one 74HC154 to next 4 x 74HC154 inputs .......
 

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