[Diy_efi] Re: looking for help with a prom N82S181

[Ludis Langens]

mbelloli at speedymotorsports.com wrote:
> 
>      Ludis, I'm following you.  Now looking at that waveform trace it
> never reaches ground, nor vcc.  When is the logic true?  This is what
> I'm not following.  Is there a voltage threashold that needs to be
> considered?  Something like the o2 voltage on a gm car crossing the
> .42 volt threashold?

For TTL logic, the spec is that anything below 0.8v is a "0" and
anything over 2.0v (or is it 2.4v?) is a "1".  With MOS (CMOS, NMOS,
PMOS) chips, the levels can be closer to the power supply rails,
however, many MOS chips have adapted the TTL levels for compatibility.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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