2182Test Equipment and Circuit Debugging, was Re: surplus MSI/88e
- Jun 2, 2004
> What's even more "hen's teeth" is a low-cost logic analyser. I've seenIt depends on what you want, and I've seen a fair few that provide
> 1652Bs going on Ebay.com fairly cheaply, but almost all of them had "No
> international bidders, too heavy to ship" at the bottom of the item
> I saw one on ebay UK a while back - it got sold to a "breaker" -
> someone who
> buys working test equipment and then rips it apart. I expect the
> boards from
> the analyser he bought (for well over what I've seen them sell for
> the major test equipment dealers) to appear on ebay at some point in
> the next
> month. *sigh*.
international shipping (as well as listings from several different
countries.) If you're willing to settle for an old 1600A, you can get a
real bargain, and it perfectly adequate for just about any retro
project and most AVR/PIC/etc.-type microcontroller projects.
There's one HP 1652B logic analyser listing for the UK up on EBay now,
I didn't look at it in detail, though.
> An oscilloscope is useful, but totally hopeless for watching theAdd a 47K pulldown resistor to the /WE line for a start. My experience
> line and the data bus at the same time :-/
is that it's needed, whether you're using 2102's or new ICs. Without it
there may not be a long or low enough pulse on the downstream side of
the Memory Protect diode-OR to ensure reliable writes.
A dual-trace storage scope won't let you watch the entire data bus, but
you can watch one bit and /WE. Though I know it's nothing like having a
When I built my first Elf I thought I was in fat city because I had
both a regular VOM as well as a digital VOM that I had added a Hold
feature to, not to mention a buddy who had a scope, and would be
willing to even haul it over to my place. I guess it's a good thing the
only problem I had with my first Elf was a cold solder joint.
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