Hello! I'm still alive. Sadly, none of my Mac-related projects have seen any progress in months. If somebody wants to run with either the Floppy Emu or the Plus Too and try to finish them off, that's good by me. It's probably best to send me email through the Big Mess o Wires blog, since I haven't been logging in here very often.
Plus Too (the Mac Plus clone) is more of a research project than anything practical. It's probably only 25% done, though I never really defined what "done" was. It can boot a floppy image stored in ROM, and run System 6.0.7 and basic programs like TextEdit, but it's buggy and crashes at random times. There's no keyboard, sound, LocalTalk, or SCSI support. Something is wrong with the interrupt handling that I never figured out. It was fun to work on, but I'm not sure I'll take it further.
On the other hand, the Floppy Emu is maybe 80% of the way to being a usable product. It's only tested with 800K disk images (no 400K or 1.4MB), and writing to the emulated floppy only works on high-speed SD cards, and a few specific write operations like formatting the emulated floppy don't work at all. I also intended to write some software to let people manage a collection of different disk images on the SD card, but at the moment it's just one disk image per card, which is quite a waste with a 2GB SD card! But despite all those issues, it pretty much works as advertised. I used it just a couple weeks ago to boot a 512ke when my boot floppy went bad.
The biggest issue making Floppy Emus in any kind of volume might be cost and parts availability. I've forgotten now, but I think my prototype was like $50 in parts, before considering manufacturing cost and any kind of profit margin. It also requires a DB-19 connector, which is super difficult to find. I have the parts on hand to build two more, and that's it.
