Apple II - Apple-1 Emulator ROM Card

What is it?

A minimalist Apple II 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 holding the full Apple-1 ROM image, and a handful of 74LS TTL chips that quietly remap the address space.

The result: the authentic 1976 \ prompt, running on hardware you already own.

Why Was It Made?

Original Apple-1 computers are scarce and fragile — even bare replicas require 40-year-old parts. By letting the Apple II supply the 6502, RAM, keyboard, and video, the entire "Apple-1 experience" is reduced to a single modern EPROM and a few dollars of 74LS glue logic. Every enthusiast gets a rock-solid, affordable way to see the 1976 monitor prompt.

What Makes It Special?

• One-chip wonder: The 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 4KB BASIC means every vintage type-in listing — from "Star Trek" to "Micro-Chess" — runs unaltered
• DIY transparency: The entire 64KB image is open source — swap the EPROM and boot your own 6502 monitor, diagnostics, or tiny games in the unused upper 32KB

Key Features

• Compatible with Apple II, Apple II+, and Apple //e
• 27C512 EPROM — holds complete Apple-1 ROM image
• 74LS TTL address space remapping — transparent and reliable
• Woz Monitor + Apple-1 BASIC included
• SAVE/LOAD via Apple II cassette port
• Open source 64KB ROM image — fully customizable
• No jumpers, no configuration required
• Standard Apple II slot card form factor

How It Works

When inserted into any Apple II peripheral slot and powered on, the 74LS logic remaps the 6502 address space to match the original Apple-1 memory map. The 27C512 EPROM provides the Woz Monitor and BASIC at their original addresses. The Apple II's existing 6502 CPU, RAM, keyboard encoder, and video circuitry do all the work — the card simply tells them to behave like a 1976 Apple-1.

Compatible Systems

• Apple II
• Apple II+
• Apple //e