Commodore C128 A/V Adapter

Commodore 128 A/V Adapter – S-Video, Composite, Audio (Stereo)

Connect your Commodore 128 to a modern TV, monitor, or converter using standard, easy-to-find cables — no need to hunt for rare dedicated DIN leads.

The adapter plugs directly into the computer’s A/V port and outputs signals to standard connectors:

• S-Video (4-pin mini-DIN) – the best picture quality from the C128, sharper and cleaner than composite
• Composite (RCA/cinch, yellow)
• Audio L / R (RCA/cinch, white and red)

Key features

• Adjustable chrominance attenuation – the board includes a 330 Ω resistor on the S-Video chroma line. This helps prevent overdriven signal and “smeared” colors on many TVs. If your display requires the full signal, the resistor can be bypassed with a jumper.
• Ready for stereo – an optional second audio output from pin 7 of the A/V port (for example with Stereo SID, FPGA SID, ARMSID, etc. modifications) can be routed to the right channel. By default, both channels carry the same mono sound, so the adapter works right away with any C64.
• No special cables required – all you need are standard S-Video and RCA cables that you likely already have at home or can buy in any electronics store.
• 3D-printed enclosure – the board is housed in a neat, custom-fit PETG enclosure that protects the electronics and makes plugging in and removing the adapter easier.
• Proven design – based on the open hardware design by Sven Petersen (Rev. 2), well regarded in the retro computing community worldwide.

Compatibility

• Commodore 128 with 8-pin A/V port – full functionality, including S-Video.

Project:

Sven Petersen, GPL-3.0 license – sources available at github.com/svenpetersen1965/C64-A-V-Adaptor