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C64/ Diagnostic Harness - The Ultimate Diagnostic Solution

This comprehensive C64Diagnostic Harness is designed to provide accurate testing and diagnostics for your Commodore 64. Whether you’re a collector, enthusiast, or technician, this kit ensures thorough checks of your system’s I/O connections. Here’s what’s included:

User Port Module: Connects to the user port on your C64.
Cassette Port Module: Interfaces with the cassette port.
Serial Loopback: Essential for testing serial communication.
2 Controller Port Connectors: Ensures proper controller functionality.
C64 Keyboard Dongle: For C64 testing

Features:

All dongles have been keyed to only be plugged in one direction.
Each component comes in a 3D printed case to protect the critical components
Based on Sven Peterson’s design, this harness pairs seamlessly with the 586220+ diagnostic cartridges.
Use it with the C64 Diagnostics cartridge to accurately test I/O connections.
Refer to the original support manual for guidance on diagnosing any reported failures

Note: Only the Diagnostic Cartridge and dongles are included, the Commodore 64 and monitor and other non-diagnostic components are not included and used only for demonstration purposes. The C64 Dead Test cartridge (based on the 586220 diagnostic cart) was originally used by Commodore technicians to diagnose C64 issues. When paired with this full test harness, it exercises the CPU, system RAM, ROMs, dedicated ICs (SID, PLA, VIC, CIA, etc.), and various I/O circuits of the C64.

Shipping:
We are very mindful of shipping costs within and from the USA. You will only pay the actual shipping cost. We always try to combine shipping. If you pay more than the actual shipping cost, we will refund the difference. All items are shipped with insurance and tracking for your peace of mind. To save you money, we may substitute eBay shipping for USPS if the delivery time is the same or faster, and it includes tracking and insurance. Any price difference will be refunded to you.

Note on Combined Shipping: eBay does not always do a good job on calculating combined shipping. Rest assured that we will do our best to minimize shipping cost and refund the difference and you will ONLY pay the actual cost of shipping.

International Buyers – Please Note: This product is manufactured and sold in the USA. Import duties, taxes, and tariffs are not included in the item price or shipping cost. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to purchasing.

This complete package is perfect for enthusiasts, collectors, and anyone maintaining these classic machines. Buy with confidence, knowing you’re getting a reliable diagnostic solution for your beloved Commodore system! 🕹️🔍