Thanks again for your help, pal.
Quite a bit's happened since I last looked at this thread. Primarily, I've bought another Pi! I'm putting a second one together, myself, from scratch - and I'm beginning to get my head around Raspbian. I think this second Pi will end up becoming another RetroPie platform, but one that I've tailored myself from the ground up, and attached to a TV rather than confined to a cabinet. I'm enjoying the challenge - plus, I feel slightly less of a fraud than I did a couple of months ago...!!!
Can I ask, does the Pi have a known 'threshold', when it comes to emulation? For instance, can it make a solid fist of the N64 and/or original PlayStation? And what about slightly more niche stuff from the same era, like the Saturn...?
Thanks again to anyone who can advise,
DH.