Mainly my apple 1 emulator based on Mike Chambers 6502 emulation code.
some others files:
f-gen.zip - simple frequency generator; just arduino uno required - python tkinter gui on PC
dramarduino.zip - 4164/41256 DRAM Tester with Arduino UNO
pw_freqcnt.zip - frequency counter
A1replica.zip - A1 replica gerber files
pom1.zip - apple 1 emulator in java