Reply on how to drive leds

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1 total messages Started by James J. Spangler Tue, 25 Sep 1984 13:12

#82

Author: James J. Spangler
Date: Tue, 25 Sep 1984 13:12

9 lines
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 I have been expermenting with zx81's and find that using a 8255 I/O chip
is the best way for me. It has 24 I/O lines that  can drive a 5 volt logic
level, which can be used to drive leds, scr's, and triac's. 
 Besides using the 8255 you would need address decoders, which can be done
with a 74LS138 and a few other 74's. I have also tried voice interfacing
using the GE SP-0256 which seems to work well.     

                                                         Jim

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