I’ve never heard of either of them but the MacSerialJunkie forum is still up, it’s just exceedingly slllllllooooowwwww and requires registration (fair enough).

There are sites that claim to have iSerialReader, but a new version that looks really sketch from a different site, and is apparently geared toward newer releases from what little I could see. The old version, probably the one you’re thinking of, appears to have been great, one of those straightforward things that you could get from a single place that kept it updated with crowdsourced data, but it’s not around anymore.

I’ll definitely have a look at the MacSerialJunkie forum when I get a chance, because at first glance it looks like they’ve kept all their posts since 2008, which might prove helpful for anyone like me running vintage apps on an old Mac. Thanks for the recommend, really appreciated.

Dude. This one worked. All it needed was to be valid one time, and it was. And they have the updates as well, if I decide to install them.

Many thanks. Seriously. May it come back to you.