The apple 2e community has one

[rdolores]

This is sort of what I was getting at in the other thread.  There's a doo-dad that allows them to plug a Raspberry Pi into an Apple 2e to add features.

http://schmenk.is-a-geek.com/wordpress/?cat=10

There are at least 2 Rasberry PI apps for the Amiga 500:

1. Floppy Drive emulator: http://hackaday.com/2013/11/26/raspberry-pi-emulates-an-amiga-500-floppy-drive/

2. Ethernet Adapter: http://www.youtube.com/watch?v=fEonOb5SkEg

The first one plugs into the A500's floppy connector on the motherboard, while the 2nd connects to the external serial port via null modem cable.

One could conceivably connect it to the side expansion on the A500 for other possibilities:
- RTG using the HDMI port.
- USB ports (Keyboard/Mouse, Flash Drive, etc...)
- Memory Expansion.
- Accelerator using ARM chip to emulate a really fast 680x0.
- Ethernet.
- AHI audio.
- Hard Drive using SD Card.

[rdolores]

Well, with an Amiga and another computer running UAE you can use Siamese RTG and have your way: share drives, use remote input devices, network, and RTG.

It just requires that you take some time adjusting the software for that purpose, but everything (hardware and software) already exists since a long time.

I used to have a Siamese RTG with an ebox (tiny 10x10cm PC) running WinUAE (under XP) connected to my DraCo that provided me what I mentioned, and also custom chip support (AGA) which the DraCo doesnt have, so I could play whdload games (via remote execution). I am still sorry I had to sell the ebox a year ago because I had financial difficulties, whenever I get a full financial recovery I might do it all again as I still have my DraCo waiting.

Where can we get Siamese RTG nowadays?