MC6800/MC6808 Emulator Board

Description

The MC6800 Emulator Board is a modern emulator for the MC6800/MC6808 processors, RAM and EPROMs in Williams, Stern, and Bally pinball machines — and any other MC6800-based system. Built on the Raspberry Pi RP2350, it provides cycle-accurate emulation with modern conveniences.

Supported Pinball Systems

• Williams System 3, 6, 7, 9, and 11
• Stern MPU-100 and MPU-200
• Early Bally (AS-2518-17, AS-2518-35)

Key Features

• Drop-in replacement — Replaces both the CPU, RAM and EPROM chips in one board. All you do is unplug the microprocessor and plug in the cable from the board.
• USB ROM loading — Load game ROMs from your laptop or phone via USB; no EPROM programmer needed
• Browser-based interface — Drag-and-drop ROM loading via Chrome/Edge web interface
• Cycle-accurate emulation — Exact MC6800 timing ensures perfect compatibility with original hardware
• Auto-configuration — Memory map fingerprinting automatically detects Williams, Stern, and Bally board types
• Open source — Full firmware source code and documentation available

Installation (5 Minutes)

1. Remove the original MC6800/MC6808/MC6802 CPU from your board. EPROMs and RAM can stay in if you want, or can be removed.
2. Install the emulator board’s cable (or adapter board for the MC6800) into the CPU socket
3. Connect a USB cable to your laptop
4. Open the web interface, drag and drop your ROM files
5. Click Reset and Run — your game boots exactly as it did in 1980

Technical Specifications

• Processor: Raspberry Pi RP2350B (dual Cortex-M33 @ 266MHz)
• ROM storage: Up to 48KB in flash (10,000+ write cycles)
• E Clock: 894.886 kHz (cycle-accurate) or use the MC6800’s external clock.
• Interfaces: USB CDC, web browser, UART debug, SPI debug
• Power: 5V USB (under 200mA)