David Schmenk has created Apple II Pi, which takes a different approach than A2CLOUD. With A2CLOUD, the idea is to use your Pi as a peripheral for your Apple II.
Apple II Pi flips this around: you can use your Apple II’s keyboard, mouse, joystick, and drives to control your Raspberry Pi, primarily so you can use the GSport emulator, giving you a virtual souped up Apple II. To get benefit from this, you’ll need a screen attached to your Pi.
To use Apple II Pi, you’ll need the Apple II Pi card, or a Raspberry Pi console cable attached to a Super Serial Card (even in a IIgs) or a IIc/IIc+ serial port, via the appropriate serial cable and possibly a DE-9 (aka DB-9) male-to-male null modem adapter. The software is already installed by Raspple II or A2CLOUD (if it doesn’t seem to work, try updating A2CLOUD by typing
Once connected, boot the A2CLOUD floppy, and press space on the splash screen. The first time you do this, it will ask you to choose the slot of your Apple II Pi card or Super Serial Card. It should then connect immediately; your Apple II will sound a tone, and any keystrokes you type will show up on the Raspberry Pi’s screen, rather than your Apple II; on the Raspbian desktop, you can use your Apple II mouse. And if you want to see your Apple II prompt on your Raspberry Pi, type
a2term; prepare to be pleasantly disoriented.
Apple II Pi also lets you go straight into GSport, bypassing the Raspbian command line, by logging in with username “apple2” (no password); type alt-F4 (or openApple-solidApple-4 on an Apple II keyboard) to quit. When you do, your Pi will fully shut down.
Apple II Pi has many more sophisticated abilities, such being able to develop 6502 code on the Raspberry Pi and execute it on the Apple II. For more info on how to use it, check out Dave’s web site and the Ultimate Apple 2 forums.