First off, I know this isn't recommended, but a friend loaned me his ACA500+ to play with, and I've been trying it out with my (US/NTSC) Amiga 1000. Hooking it directly to the A1000 meant it really wouldn't start up but 1 in 20 times, and would frequently freeze up a few minutes after it started, it if did make it to start up. But here's the fun part: putting a SupraDrive 4x4 side car between the ACA500 and the A1000 made it stable. Starts up every time. Stays up. I got the idea from reading an instruction from some other supplier from 1990 or so, about their product being more reliable when it went A1000 + ram expansion + the vendor's product. Anyway, in case that helps anyone....
But... there are hints here and there about an Amiga 1000-specific version of the ACA500+. This google translated one for example:
ACE1k is in the planning phase. Small Race with the Quartz Maker: I'd like to hold the first proof-of-concept board in hand when the special parts I need to generate a synchronous 28MHz clock externally for the A1000 . ACE1k gives the A1000 the most necessary upgrades: Memory (max 8M), Kickstart and (if an Agnus is put on it and the adapter is used to the internal Agnus) also 1M or 2M Chipram. A Zorro-style 100-pin slot can accommodate a Buddha or an ACA2000. The X-Surf-500 can also be plugged without ACA2000.
1 or 2 MB chipram?? Yeah. SOOOO want that. Can you share any further about the ideas for the design? Sounds like it's early on. Is it going to be in the A1000 case or in a vertical case alongside? (With zorro style slot I guess it's external). Front-facing CF card slots? Comes with a case? rear-facing ethernet port?