I've spent a lot of time playing and tinkering with the yamaha mx100ii, and I honestly think it's one of those instruments that doesn't get enough credit these days. If you're not familiar with the name, you've probably seen one without realizing it. It's essentially the famous Yamaha U1 upright piano, but it's been modified with some pretty cool (albeit vintage) "Disklavier" technology.
Back in the late 80s and early 90s, this was the peak of home entertainment luxury. Imagine a piano that could play itself using actual moving keys, all while you sat back and drank your coffee. It was like living in the future. Even though we've moved on to much more advanced digital systems, there is something incredibly charming and surprisingly practical about the MX100II that keeps it relevant in the used market today.
It's a real piano first
One thing people often forget when looking at "player pianos" is that if the electronics die, you're still left with a musical instrument. With the yamaha mx100ii, you aren't just getting a fancy gadget; you're getting a Yamaha U1.
For anyone who has spent time in music schools or recording studios, the U1 is basically the gold standard for professional upright pianos. It's 48 inches tall, which is the "sweet spot" for string length and soundboard size. The bass is deep enough to feel punchy, and the treble has that classic Yamaha shimmer that cuts through a room.
The action—the way the keys feel under your fingers—is snappy and responsive. Because the MX100II is built on this foundation, it plays beautifully even if you never touch the power button. I've met plenty of people who bought these used, never bothered with the player system, and still ended up with one of the best uprights ever made.
The nostalgia of the floppy disk
Let's talk about the elephant in the room: the control unit. The yamaha mx100ii uses 3.5-inch floppy disks. For younger readers, that's the "save icon" in real life.
There's a certain ritual to it. You slide the control unit out from under the keyboard, pop in a disk, hear that mechanical whirr-clack, and then the piano springs to life. It feels tactile in a way that streaming music from an iPad just doesn't.
That said, floppy disks are getting harder to find and even harder to keep functional. They're sensitive to magnets, dust, and just old age. If you're buying one of these today, you'll likely find a stack of disks in the piano bench featuring everything from Elton John to classical concertos. It's a literal time capsule of what people were listening to thirty years ago.
Recording and practicing with a ghost
The "MX" in the name stands for "Mark II," and this version was a significant step up from the original. One of the coolest features for musicians is the ability to record yourself.
You can sit down, hit record, play a piece, and then watch the piano play it back exactly as you did. It's a bit eerie the first time you see it—the keys moving on their own as if a ghost is sitting there—but as a practice tool, it's incredible. You can hear your own timing mistakes and dynamic inconsistencies from across the room, which gives you a totally different perspective on your playing.
I've seen teachers use these to record "model" versions of songs for their students. The student can then play the disk back at home (if they have a compatible piano) and see exactly how the teacher handled a difficult passage.
Dealing with aging electronics
Since we're being honest, we have to talk about the downsides. The yamaha mx100ii is a vintage machine. The solenoids—the little plungers that push the keys up from underneath—are generally very robust, but the capacitors and internal sensors can eventually wear out.
If you find a unit where some keys aren't playing back at the right volume, or if the control panel is acting glitchy, you might be looking at some repair work. The good news is that because so many of these were sold, there are still technicians who know how to work on them.
The most common issue I see is the belt in the floppy drive. Over time, the rubber becomes brittle and snaps. It's actually a pretty cheap and easy fix if you'm handy with a screwdriver, but it's something to keep in mind. If the drive doesn't spin, the "player" part of your player piano is basically a paperweight.
Can you modernize a Yamaha MX100II?
This is where things get interesting. A lot of people think they're stuck with floppy disks forever, but that's not true. There are actually floppy-to-USB emulators that you can install. You replace the old drive with a little unit that has a USB port, and you can load thousands of MIDI files onto a single thumb drive. It breathes completely new life into the instrument.
If you want to go even further, Yamaha used to offer a "Wagon Grand" or external control units like the DKC-850 that could bypass the internal system. While those specific units are getting rarer, there are modern MIDI interfaces that can sometimes be rigged up to communicate with the older Disklavier hardware.
Even without those upgrades, you can connect the piano to other MIDI devices using the ports on the back. It's surprisingly flexible for a piece of gear that was designed when "The Fresh Prince of Bel-Air" was still new on TV.
Why it's often a bargain
Here's a little secret about the piano market: the yamaha mx100ii is often cheaper than a standard U1 of the same age.
Why? Because many buyers are intimidated by the electronics. They see the control box and think, "That looks complicated and expensive to fix." Or they think the player system somehow ruins the "purity" of the piano.
Because of that hesitation, you can often find an MX100II in great condition for a steal. You're getting a professional-grade Yamaha upright, and the player system is essentially a free bonus. Even if you never use the disks, you still have a world-class instrument in your living room.
What to check before you buy
If you're hunting for one of these on the used market (like Facebook Marketplace or Craigslist), there are a few things you should definitely check:
- The Control Unit: Make sure it actually powers on and the display is readable.
- The Drive: Bring a floppy disk with you (if you can find one!) and make sure it loads.
- The Keys: Play every single key. Then, play a disk and make sure every key moves during playback. Sometimes a solenoid will die, meaning the key works when you play it, but won't move when the piano plays itself.
- The Condition: Just like any piano, check the hammers for deep grooves and look at the strings for rust.
It's also worth asking if the "power supply" has been serviced. These units have a separate power box, usually hidden near the pedals or under the keybed, and they can get dusty or loud over time.
Final thoughts on this classic hybrid
The yamaha mx100ii represents a specific era of Japanese engineering where "overbuilt" was the standard. It's heavy, it's durable, and it sounds fantastic. It bridges the gap between the traditional world of acoustic pianos and the digital world of recording.
Whether you're a serious student who wants to analyze your own performances, or just someone who wants a high-quality piano that can provide background music for a dinner party, it's hard to go wrong here. It has character, it has history, and most importantly, it has that unmistakable Yamaha sound that has defined modern piano music for decades.
It might be "old" tech, but in the world of pianos, a well-made instrument never really goes out of style. If you find one in good shape, don't let the floppy drive scare you off—it's part of the charm.