[sdiy] Update ... and a warning

[Tim Ressel]

Hey all,

I just built a dual UART board for my nifty new
development system. I wanted to verify the address
decoding was working right, so I got out my borrowed
60MHz scope and checked the chip select line that
comes out of the processor.

No pulses.

Then I did a sanity check and looked at the select
line for the RAM chip on the dev board.

No pulses.

I haden't checked the RAM to see if it actually
worked, so I did a memory check. It worked. Ahhh....
I got out my el cheapo Radio Shack logic probe and lo!
there were all the missing pulses.

The moral of this story is: test equipment can lie,
decieve, mislead, and in general be a pain. So always
double check your measurements and make sure your
scope ain't hiding your pulses!

---Tim


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