QRZ is working fine for me.
It was the web site that was down. Down for many people and also the “DownForMe” type sites which check things. It could have been a routing issue so that some web traffic could reach the servers. That could explain your lack of issue.
No… I haven’t got time. I flatly refuse to go up into the loft and bring down my 1984 vintage Commodore C16 to see if it still works.. 
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What about if you accidentally on purpose go up to the loft? 
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I’ve still got my Nascom II. It looks like by version 3 of the RAM card they had added some decoupling:
I added a microSD card for scale
I wrote my own split-screen RTTY software in Z80 assembler and used it in quite a few BARTG contests back in the day.
Jonathan G4IVV
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Do you still have the code anywhere? Could be handy for the Internet Archive?
Put the above together a few years ago. Based on the designs by Ben Eater
Processor was actually a 65c02 and used mainly from a terminal on the PC via the serial chip. If I remember correctly, it had both 64Kb ram and 64kb of Rom on the chips but only 64kb total available. It was split 50/50 with the Rom being the higher 32k of total memory. It was just simpler to implement with a single address decoder chip rather than some banking style memory configuration.
The eeprom contained by MS Basic interpreter and a monitor. I did manage to get the 6522 Via working with a 2 line lcd display and a ps2 keyboard, however it slowed everything down to a crawl.
I still have it on a shelf but not sure if it still works as the wiring was prone to come out of the breadboard at the slightest touch.
I did consider trying to add a display board set of breadboards and designate some of the ram as display memory, but it looked very fiddly and the timings had to be exact which wasnt something easily done on breadboards.
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