Purpose

The purpose of this project is to provide I/O for an Apple II series 8 bit computer via a Raspberry Pi Zero W which is powered by the Apple II expansion bus. This includes using the attached RPi Zero W for it's storage, network and processor to provide new functionality for the Apple II.

Features

1. Boot message which waits for RPi to be ready
2. ProDOS bootable drive from image stored on RPi
3. Linux bash shell to the RPi from the Apple II including some VT100 support via -SHELL from ProDOS
4. Load binary files directly from the RPi to the II (temporarily removed from firmware but will come back as a utility or dynamic virtual drive
5. Update Apple II firmware in place from image on RPi (note, this is done per slot)
6. Supports two drive images at the same time
7. Supports "RPI" command from BASIC to execute Linux commands from the command prompt or inside BASIC programs: 10 PRINT CHR$(4);"RPI ls -al /"

Setup

https://github.com/tjboldt/Apple2-IO-RPi/discussions/63

Sixth Revision Hardware

New hardware revision adds a jumper to select internal (Apple expansion bus) or external (USB) power.