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James J. Spangler
Sep 25, 1984, 9:12:40 AM9/25/84
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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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