19 Jun
2004
19 Jun
'04
4:28 p.m.
This is not exactly hard to design. To do it purely
digitially, you
can use a 4 line to 16 line decoder (e.g. a 74x154) if you want 'dot'
mode. To do 'bar' mode, it's a simple exercise to design the logic,
and if you like burn it into a PAL (or PROM, or...).
PAL? PROM? What overkill. What's wrong with diodes and wire-OR?
Well, besides needing 136 diodes, I suppose. :-) Or somewhat fewer if
you apply a little intelligence; I can bring it down to somewhere near
110 without much trouble, probably further with a bit more thought
(and/or a bit more additional logic).
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