Roland U-220 (1988)
A single rack space of ROM samples that made the U-20 keyboard redundant - and spent the next decade quietly holding down the piano, strings, and brass in studios that never gave it a second thought.
Overview
One rack unit. That is the whole physical pitch of the U-220. Roland took the U-20 keyboard, released in 1989 according to Wikipedia's account of the sibling, and stripped it to a compact single-space sound module with, in Vintage Synth Explorer's phrasing, "all the same sounds and features." The rack version is dated to 1988 across the Roland dealer and retail sources that carry it, which puts the module slightly ahead of its own keyboard parent. Owners who have spent time with both tend to describe it the same way: the U-220 is the U-20 with the keys removed.
Inside is a PCM sample-playback engine built on 16-bit samples, with waveforms coming from ROM. There are no user samples and no analog oscillators. Roland's RS-PCM designation appears on the module and in the retail listings that sell it. This is a sample-replay instrument, not a synth in the subtractive sense. The sound set is broad and workmanlike - pianos, strings, brass, and percussion are the categories the dealer copy names - and a handful of the waveforms come from Roland's own back catalogue. The stereoklang.se write-up notes that several samples are "drawn from classic Roland synths like Jupiter-8 and D-50," and a preset called "Native Dance" is documented on Audiofanzine's forums as a direct lift of the D-50 patch of the same name. The U-220 was a way to get the recognizable Roland sounds into a rack without buying the flagship keyboards.
Polyphony is where the documentation gets slippery. Guitar Center's used-listing copy claims 30-voice polyphony and 6-part multitimbrality. The identical dealer text carried across omk.by, freelove.by, synthesizer.by, and max.farm describes the same module as a "16-voice polyphonic" multitimbral unit. Both figures cannot be right, and no service manual or factory spec sheet in the archive settles it. Every source agrees the U-220 is multitimbral. The disagreement is only about how many parts it can split into. Treat the part count as unresolved and the polyphony as somewhere in the 16-to-30 range until a primary document turns up.
The rest of the feature set is what a working rack module of the era needed and nothing more: onboard reverb and chorus, MIDI In/Out/Thru on the back panel, and an external memory cartridge slot for expanding the sound library beyond what shipped in ROM. Patch memory is documented as 128 presets and 64 user locations, according to a Pinterest pin that is the only source carrying the figure. Treat it as single-sourced.
Key Features
RS-PCM Sample Playback with 16-Bit Samples
The U-220's engine is a ROM-based PCM player built around 16-bit samples, per Guitar Center's listing copy. The sound is fixed at the factory. You don't design sounds from oscillators and filters. You pick from a set of recorded waveforms and shape them with the onboard processing. For a 1988 rack module aimed at session and production work, that gave instant access to usable pianos, strings, brass, and percussion without the load time or the cost of a sampler. The pianos and strings in particular carry the bright, slightly glassy character of late-'80s 16-bit ROM playback, which is either the reason to own one or the reason to pass, depending on what you are chasing.
Borrowed Waveforms from the Jupiter-8 and D-50
Several of the U-220's samples are documented as carried over from Roland's own classic instruments. The Jupiter-8 and the D-50 are the two named by stereoklang.se. The "Native Dance" preset is specifically identified on Audiofanzine's forums as a sample of the D-50 preset of the same name. That puts recognizable Roland timbres into a rack at a fraction of what the donor keyboards cost. Collectors who own a D-50 and a U-220 sometimes describe the U-220 as a second layer of the same sound without buying a second D-50, and the preset overlap supports that reading.
Multitimbral Operation and MIDI In/Out/Thru
The U-220 is a multitimbral module, and every source agrees on that much. It has full MIDI In, Out, and Thru on the back panel, per Guitar Center. That suited the rigs it lived in: a sequencer or master keyboard driving several parts at once, with the Thru port passing the chain along to the next module in the rack. The part count is contested (see Overview). The box itself is built to be addressed by a computer or a controller and to sit in a stack of other boxes doing the same.
Onboard Reverb and Chorus
Roland built reverb and chorus into the module rather than leaving them to outboard gear, according to Guitar Center's listing. For a single-rack-space unit in a project or mid-tier professional studio, that was a real convenience. The U-220 could go into a rig and produce a finished-sounding part without tying up a reverb unit. The effects are period-appropriate rather than luxurious, and nobody buys a U-220 for its reverb algorithm. But they work, and they save a patch bay.
128 Presets, 64 User Patches, and a Cartridge Slot
Patch memory is documented as 128 presets and 64 user locations, with an external memory cartridge slot for expansion, per a Pinterest pin that is the sole source for these figures. The cartridge slot matters more than the patch count. Roland's ROM card ecosystem was how a U-220 owner expanded the sound library without replacing the module, and the service notes preserved on archive.org confirm that a "U220 factory preset card" was a real, orderable part from Roland service stations. The card format is not documented in the archive, so treat any claim about which specific cards are compatible as unverified.
Historical Context
The U-220 arrived in 1988, per the Roland dealer sources. Wikipedia describes the U-20 keyboard as the keyboard version of the U-220 module, which was itself "a similar follow-up product to Roland's U-110 rack module of 1988." That makes the U-220 the middle step of a three-step progression: U-110, then U-220, then the U-20 keyboard carrying the same engine in a playable form. The module slightly predates its own keyboard sibling, an unusual order of release.
The archive's own summary of the U-220's working life is that it "spent the first half of the 1990s in professional studios and in the UK classifieds." The site metadata credits it to Howie Tee and DJ Jazzy Jeff, and EQ's August 1992 studio features back that up. A visit to Howie Tee's Brooklyn room shows a U-220 racked beside an Akai S950/S900, a Roland JD-800, a D-50, and a Korg M-1R (p.57). A separate profile of Jazzy Jeff's Touch of Jazz studio lists one next to a JD-800, D-110, D-550, and Yamaha TG77 (p.54). Both rigs were built around hip-hop and R&B production. EQ's own buying advice in the same period recommended it as a module with "30 voices and the ability to handle up to six parts PLUS a rhythm part" - the source of the 30-voice and 6-part figures that conflict with the dealer copy.
Collectibility & Value
The U-220 is not a collector's instrument the way a Jupiter-8 or an MKS-80 is. It is a working module, priced accordingly. Recent eBay listings in the archive show single units at $120 and $149, a four-item rack lot including a U-220 and an Opcode Studio 64X at $412, and a v1.02 EPROM firmware upgrade chip at $19.95. The EPROM listing confirms that the U-220's operating firmware is socketed and upgradable, and that at least one revision, v1.02, circulates as a spare part. Owners with an early unit and odd behavior have a documented upgrade path.
The most common failure reported is the internal battery. A Gearspace thread describes a U-220 displaying "weird characters on the display and telling me the internal battery is low every time I switch it on" - the classic symptom of a dead backup cell, and the point at which user patches vanish. The service notes preserved on archive.org spell out the recovery: a memory initialization that resets all temporary data, followed by a factory data load, which requires the "U220 factory preset card" ordered from a Roland service station. The same notes warn that replacing the battery or the working RAM can destroy the contents of working RAM, so a bulk dump before service is the safe move. Gearspace's advice is to dump from one U-220 to another, but "make sure you do not do the dump backwards then you will have 2 without patches." A display replacement kit with a brighter backlit LCD is also available from at least one aftermarket supplier, and a "Roland U-220 Switch Board Assy 79574120" turns up on eBay with operation confirmed, which helps anyone chasing a dead button.
Check the display for the low-battery message on power-up, confirm that patches survive a power cycle, and ask whether the unit has the factory preset card or a bulk-dump backup. A U-220 with a dead battery is not a lost cause, but it is a project, and the price should reflect that. Units turn up on Guitar Center, eBay, Avito (Russian-market listings note 100V power, so check the voltage before buying from abroad), and leboncoin. No dated current market prices were captured in the research, so treat the eBay figures above as recent asking prices rather than a settled market value.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.