The site is currently down (for me, at least):

https://web.archive.org/web/20260920202324/https://www.dxoma...

I've got a standard check-list of tests to run before any deep analysis on faulty circuit behaviour:

1. Check the power rails are correct and stable (at the target devices, not the PSU source)

2. Check the resets are correct (polarity, level, sequencing) and reaching where they're needed

3. Check the clock is toggling cleanly (no jitter, has clean monotonic waveform)

4. General signal integrity and setup/hold of signals that are related to the issue

That catches a lot of basic issues. If those are all clean, then you go deeper.

To the article author's suspicion of crystals, I have seen crystal oscillators fail (stopping toggling) as ambient temperature ramps up and down; that's a nasty one to catch and prove, but it can happen. Changing vendor was the only solution there.

This extension is blocked under Firefox for the following reason:

This add-on violates Mozilla's add-on policies by collecting user data without disclosure, consent or control and executing remote code

I have a RiscPC in the shed and a half-repaired A3000. I don't fire them up them often, but both have !Director launching on boot; it is a wonderful program. Thanks!