Commodore Plus/4 PSU

Commodore Plus/4 PSU by Electroware: based on our C64/C128 experience. Created to protect your rare Commodore Plus/4 (+4) from the dangerous voltages of the 40-year-old Commodore “brick of death” PSU.

Stay original! Buy only the genuine C64PSU.com gear and beware of overrated clones flooding eBay & the web.

GET READY! NEW PSU FOR YOUR PLUS/4

Released in 1984, the Commodore Plus/4 wasn’t the commercial hit the C64 was—but it brought interesting ideas for its time: ROM-integrated software, a faster CPU, a 4× faster FDD, more colors, a new BASIC v3.5 (with new commands and fewer bugs), and a smaller, more modern case compared to the C64 “breadbin,” ZX Spectrum, and Atari 800XL. The biggest misstep was software incompatibility with the C64, alongside hardware oddities (joysticks, datasette, etc.). One thing both Plus/4 and C64 share, however, is the same PSU concept—the infamous “brick of death,” a top cause of failures. Thanks to years of community education, many Commodore users now understand this risk—good!

Our replacement Plus/4 PSU is a modern replacement power supply for Commodore Plus/4 computers. It provides clean, regulated 5 VDC (up to 4.0 A) from an industrial-grade AC/DC stage and a true 9 VAC (1.11 A max) from a robust linear transformer—just like the original design. Everything fits a compact enclosure with proportions similar to the factory unit. A durable, professionally molded case ensures ventilation, mechanical protection and electrical isolation. The unique square 4-pin plug is custom-made for this PSU (no longer available off-the-shelf), which is why some users convert the Plus/4 socket to 7-pin DIN like the C64 for convenience—personally I prefer to keep the machine original. :)

THE CLONE HUNTING GAME

For many years we’ve listened to your feedback and delivered a unique, purpose-built replacement PSU for Commodore computers. With continuous input from the global community, our design improves with every revision—this is the 12th, engineered with retro-computing care by active Commodore users and collectors.

We’re proud that our original PSU has become a widely accepted industry standard. Unfortunately, it has been copied—often simplified and stripped of protections—by sellers chasing “easy” profit, wrapped in fancy cases and empty slogans like “designed from scratch.” Please beware: we cannot vouch for the safety, quality or performance of these clones.

THE FULL-FEATURED Commodore Plus/4 PSU

• Commodore Plus/4 compatible
• Stabilized & filtered 5 VDC up to 4.0 A output (20 W)
• 9 VAC up to 1.11 A (10 VA) via real heavy-duty transformer (voltage matches the original)
• Carefully calibrated for the Plus/4 reference load
• 5 V fine-tuning available with the Adjust & Protect LED Module add-on
• Multiple active & passive over-current and over-voltage protections (OVP/OCP)
• Fully isolated, fused on AC and DC sides
• Power On/Off switch
• Status LED
• Long output cable (1.8 m) with square 4-pin DIN plug
• Detachable input AC cable for UK, EU and AU (1.8 m included)
• Fixed 1.8 m input AC cable for USA versions
• Weight ~0.6 kg (about 2× lighter than the original)
• Runs cool

POKE LEVEL UP WITH THE “ADJUST & PROTECT MODULE” ADD-ON

The Protect & Adjust hardware adds a basic 5 V fine-tune in a safe, limited range of 4.9–5.3 VDC (measured with a Plus/4 as the reference load). You can dial in an exact 5.00 V for your system—useful as aging, peripherals and cable drops vary by setup. It’s especially handy when switching between C64C, C64 “breadbin,” Plus/4 or C128 via adapters (each draws slightly different current and voltage).

If you need more advanced adjustment (wider range, higher precision, premium components, ultra-low ripple), see our Plus/4 PRO PSU model.

UNIQUE FEATURES & QUALITY

Stay with genuine Electroware products to get build quality and features clones don’t offer:

• Dedicated ON/OFF switch (save energy and spare the fragile Plus/4 main switch)
• Detachable AC input cable for EU, UK and AU (1.8 m included; longer cables possible). Fixed 1.8 m cable for USA versions
• Status LED (green)
• 100% repairable; easy to disassemble by a qualified technician; spare parts available
• Industrial, detachable wire-to-board connectors—no unsafe direct wire-to-board soldering
• Optional 5 V fine-tuning add-on (Adjust & Protect LED Module)

TRUST & RESPONSIBILITY

Every Electroware Commodore Plus/4 PSU is triple-tested before dispatch. For long-term reliability we test with original Commodore hardware from our collection and perform burn-in with custom loads up to ~150% of a typical Plus/4 system.

Choose genuine Electroware to get top build quality and unique features unavailable in clone products.

By purchasing this product you support the C= community worldwide and our ongoing development. Thank you!

Warning!

Risk of electric shock and energy hazard when opened. Service must be performed by qualified technicians only. Protect ventilation openings from foreign objects and moisture. Do not install near heat sources or in hot, dusty or damp locations. For indoor use only. Do not exceed the rated output current or wattage.

This replacement Commodore Plus/4 PSU is designed for Commodore Plus/4 vintage computer systems only and should be considered an integral component of the Commodore Plus/4 system. Do not connect to other devices. The manufacturer is not responsible for consequences of unauthorized repairs, modifications or misuse. A new PSU reduces failure risk but cannot guarantee overall health of a ~40-year-old system.

Stay original! Buy only the genuine C64PSU.com gear and beware of overrated clones flooding eBay & the web.