Japanese market exclusive FM Towns Marty, a 90's retro gaming "computer", operates solely on 100V AC power. If you are like me, living in a 220-240V world, you will need a step down transformer everytime turns the machine on, and keeps remind yourself that never plug it directly into wall. Or maybe you unfortunately did so after a Friday beer and made some magic smoke. Even for 100-120V world, the original PSU might suffer from aging capacitors and not able to providing enough clean power.

Marty Power Banchou is built to fix that problem: a drop in power supply board, with the same mechanical switch, same power connector to the mainboard, same power port with a 3D printed cover, made with modern DC-DC power conversion technology. Feels exactly the same(actually cooler, temperture wise) but operates on a universally available 12V DC power adapter. All you need is a 12V (2A and above) DC power supply with a barrel connector(2.1mm or 2.5mm), a Philips screw driver, and a little patience. No case mod, no drilling, no soldering, no swapping original parts, no nothing.

Overview

Marty Power Banchou replaces the original Japanese 100VAC only PSU, with a modern DC-DC power conversion board that takes 12V DC power via a 2.1mm ID or 2.5mm ID barrel connector.

• Fully compatible with Marty model 1(beige/white) and model 2(grey)
• True drop-in replacement, even replicates the push feeling of the power switch
• No case mod required, same design philosophy as my PC-FX Drop-in Power Supply
• Designed for easy installation, clean integration, wide compatibility and long-term reliability

Installation

• Philips screwdriver PH1 or PH2
• A pair of nippers of scissors
• A little patience(to read the instruction)
• Guide will be provided in the links below

What's Included

• Marty Power Banchou board
• Free 3D printed power port cover
• Connector to the mainboard is integrated to the power board
• 12V DC power adaptor is not included

Features

• Reverse polarity protection
• Overvoltage protection(protect up to 28V, cuts the power if provided power exceeds 13V)
• High quality capacitors from Samsung, Nichicon and Murata
• Power IC from Texas Instruments
• Replaceable fuse
• LED indicators
  • Input power good
  • 3 different output power rails
• Fits nicely with the not-so-common power socket on the mainboard, no mod required
• Drop-in installation, use the same power outlet port, use the same screws/bolts.

Power adaptor requirements

You will need to source a suitable DC power adaptor, but it should be cheap and universally available. My local recycle shops have tons of them, from unwanted broadband modems.

• Output: 12V DC
• Current: ≥ 2.0A recommended
• Connector size
  • Inner diamter = 2.1mm or 2.5mm
  • Outer diamter = 5.5mm

Always use a regulated, high quality adaptor for stability.

Notes

• It will not magically fix the floppy drive
• It will not magically fix the CD-ROM drive
• It will not magically fix a non-booting FM Towns Marty, unless the fault is the original PSU
• An unserviced FM Towns Marty will likely to repair C22 related issue. You may find my repair logs useful: here and there.

All orders ship from Wellington, New Zealand by NZ Post International Economy Tracked, usually within 2 business days of your order (excluding weekends and NZ public holidays). You'll receive tracking details by email once your order is on its way.

All items, regardless of size, are sent as a tracked parcel to meet customs requirements. There is no extra shipping charge for multiple items in the same order.

Please read the section for your country below. Import rules changed significantly in 2026, and for most destinations outside New Zealand you should expect to pay import charges when your parcel is delivered. ──────────────────────────────────────────────────────────────

🇺🇸 UNITED STATES

Typically 6–13 working days in transit, plus customs clearance.

✅ Nothing to pay on arrival. The price you pay at checkout is the final price.

Due to NZ Post restrictions, US orders have to be sent through their Small Business Sending service, which charges us the US import tariff plus a processing fee before the parcel leaves New Zealand. That cost is passed on to you at checkout: a 12.8% tariff line on the value of your order, plus roughly NZD $5 added to the US shipping rate. In return your parcel arrives duty-paid, with nothing to pay at the door and no customs delay.

If anyone does ask you for money on delivery, please don't pay it — contact us first and we'll sort it out.

Orders above USD $2,500 cannot be sent duty-paid. Please message us before ordering if that applies to you.

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🇪🇺 EUROPEAN UNION

Typically 6–13 working days in transit, plus customs clearance time.

⚠️ You will be asked to pay import charges when your parcel is delivered.

Since 1 July 2026 the EU has removed the old €150 duty-free threshold. VAT and customs duty now apply to every parcel entering the EU, whatever its value. Nothing is prepaid at checkout, so the full amount is collected from you on delivery.

Why we can't prepay it for you:

NZ Post's business shipping services are the only ones that can carry a prepaid-VAT (IOSS) registration or a duty-paid (DDP) arrangement through to customs. Those services don't currently reach every EU country — Germany and Austria are both unavailable on them right now. The standard service we use does reach every EU country, but it has no way to tell customs that VAT has already been paid.

We've chosen the option that reaches everyone. Your shipping cost is the same or slightly lower as a result, and nothing is hidden from you — but it does mean VAT and duty are collected at your door instead of at our checkout.

What you'll pay:

• VAT at your own country's rate, on the value of the goods.

• Customs duty of €3 per unique product type. This is charged per distinct item, not per unit — five of the same board is one charge of €3; three different products is €9. In France the charge is €2 instead of €3.

• In some countries, a postal or customs handling fee on top. These are set by your national postal service, not by us, and we receive none of it. Approximate figures:

  Belgium         €21.50 (orders up to €150)
  Denmark         180 DKK
  Luxembourg      €18 (orders €22–150)
  Czechia         €14 customs declaration fee
  Netherlands     €10
  Portugal        €7
  Cyprus          €3.50
  Greece          €2.50–€15 depending on order value
  Slovakia        €3.20–€28 depending on order type and value
  Croatia         €2.46
  Romania         25 RON logistics fee
  Malta           Malta Post customs fees apply
  Slovenia        Varies by order type and value
  France, Germany, Ireland, Italy, Spain, Poland and others — no handling fee listed

These are indicative and can change without notice. If your country isn't listed, or you want a firm figure before ordering, please check with your national customs or postal service — they're the only ones who can give you an exact number. We're happy to tell you exactly what will be declared on your parcel so you can ask them.

If you are ordering several different products, note that each distinct product adds €3 of duty. Ordering multiples of the same product does not.

Parcels to Italy may take longer than usual while the new EU customs rules bed in.

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🇬🇧 UNITED KINGDOM

No VAT is collected at checkout for UK orders. Retrology Repair is not UK VAT-registered. Typically 6–13 working days.

⚠️ Please keep your order under approximately £135 excluding shipping, to stay below the UK low-value consignment threshold. Orders above £135 will be assessed by HMRC for VAT at 20% plus possible customs duty, and the carrier will add a handling fee. If you need a larger quantity, please split it across separate orders or message us first.

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🇦🇺 AUSTRALIA

Orders under AUD $1,000 enter Australia free of GST and duty. Nothing to pay on delivery. Typically 3–6 working days.

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🇳🇿 NEW ZEALAND

Prices include 15% GST. Retrology Repair is GST-registered and a tax invoice is provided with your order. Nothing to pay on delivery. Typically 2–4 working days.

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🇨🇦 CANADA

Typically 6–13 working days.

⚠️ You may be charged 5% GST plus a brokerage or handling fee on delivery. These are set by the Canada Border Services Agency and the carrier, and are outside our control.

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🌏 EVERYWHERE ELSE

We ship to most countries. Typically 6–13 working days, longer where customs processing is slow.

⚠️ You may be charged import duty, VAT/GST, or a customs handling fee on delivery. These are set by your own country's authorities, we receive none of it, and we cannot tell you in advance what it will be. If you need to know before ordering, please contact your national customs or postal service for a figure — or message us and we'll tell you exactly what will be declared on your parcel so you can ask them.

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WHAT WE DECLARE

Every parcel is declared honestly and in full: the goods description, the price you actually paid, the tariff code and the country of origin. We do not under-declare parcels or mark commercial orders as gifts. This keeps your parcel moving and keeps us compliant, but it does mean import charges will be assessed correctly where they apply.

LOST, DELAYED OR DAMAGED PARCELS

International shipping can be slow and unpredictable. If your parcel hasn't arrived within a reasonable window, get in touch and we'll investigate with the carrier. For parcels declared lost, we'll send a replacement or refund, whichever you prefer, subject to stock.

If your item arrives damaged, contact us within 7 days of delivery with photos of the packaging and the item.

REFUSED PARCELS

If a parcel is returned to us because import charges were refused or went unpaid, we'll refund the order less the outbound and return shipping costs.

INCORRECT ADDRESSES

Please double-check your address at checkout. Re-shipping costs for parcels returned due to an incorrect address are the buyer's responsibility.

A NOTE ON POLICY CHANGES

International shipping and customs rules are changing rapidly through 2026. Everything above is correct as at 26 August 2026 and is subject to change without notice. If you have questions about shipping to your country, message us through Lectronz and we'll reply within 1–2 business days.