17 May
1998
17 May
'98
12:15 p.m.
On Sun, 17 May 1998, Tony Duell wrote:
Unless you know it's a 3.3V logic family, then I would suspect that it
too low. What is the complete number on the chip you're testing?
Most newer laptops use lower-voltage logic to conserve battery power.
This one was designed to demo a couple of highly-integrated chips, so the
only 74-series chips are some 74AC244 and 74ACT244 buffers. I tested one
of the "AC" chips.
-- Doug
first: hook up the voltmeter to the 74xxxx chip for
5v and ground.
I'm reading around 3.2V, which would make sense for a laptop.