What is it?

A minimalist slot card that turns your Apple II, II+ or //e into an Apple-1 the instant you power on. Only two parts matter: a 27C512 EPROM that holds the full Apple-1 ROM image and a handful of 74LS TTL chips that quietly remap the address space.

Why did you make it?

Original Apple-1 computers are scarce and fragile; even bare replicas need 40-year-old parts. By letting the Apple II supply the 6502, RAM, keyboard and video, we reduced the “Apple-1 experience” to a single modern EPROM and a few dollars of 74LS glue logic, giving every enthusiast a rock-solid, sub-$20 way to see the 1976 “\” prompt.

What makes it special?

One-chip wonder: 27C512 carries Woz Monitor, BASIC and bank-switch code—no flash utilities or programmers needed after assembly.
Zero configuration: no jumpers, no firmware updates, no cassette dongles—SAVE/LOAD naturally route through the Apple II built-in cassette port.
Cycle-true behavior: exact 256-byte monitor entry points and 4 kB BASIC means every vintage type-in listing, from “Star Trek” to “Micro-Chess,” runs unaltered.
DIY transparency: the entire 64 kB image is open-source; swap the EPROM and you can boot your own 6502 monitor, diagnostics or tiny games in the unused upper 32 kB.