DBCohen wrote:I had a Plus 3 back then, but I know that is sold long ago. Seems a Plus One should be the way to go to allow some Roms or disk access via the slots, but eBay has none and the pricing on their seems to have gone stupid! I have seen the GoSDC thing, but that seems a tad pricey for a single function board. Cartridge slots would allow me to do a lot more.
Is there somewhere I can buy these Minus One boards (made up, that is; I can't solder for toffee)?
Sort of! I should warn you that the Minus One isn't exactly an "end user" product like the Plus One; it's a lot cheaper and lets you have three cartridges rather than two, but:
- I couldn't find a socket that perfectly fits Electron cartridges, so you have to be a bit careful when plugging them in; you can't just jam them in or you might get a short circuit. (You have to carefully center them when plugging them in.)
- The Minus One is a little 'bare' looking, if you care about aesthetics... it's a big 10cmx10cm circuit board that hangs off the back of the Electron. I wonder if someone could be convinced to work up a case model for a Plus One, modify it to fit the Minus One, and 3D print a few

There have been various case fabrication projects for cartridges on here, but nothing for Electron expansions yet.
If you're still interested, I can send you a bare board for free, or I can post it to someone near you who can do the soldering

If you're in the USA, I can solder one for you, and if you're in the UK I believe there's a couple of people on here that have offered to help solder. The components on the board cost around US$15-16.
Cheers,
Phil