The chip had no filter circuits. Koshiro wrote the filter himself.
Yuzo Koshiro was in his early twenties when he composed the Streets of Rage 2 soundtrack. He did not use the Mega Drive's standard composition tools. He used a PC-8801 computer — hardware already considered outdated — because it gave him machine-level access to the FM synthesis chip that standard MIDI tools could not match. The FM synthesis chip lacks filter circuits — a fundamental constraint that makes recreating the warmth of analog synthesizers nearly impossible through normal means. Koshiro's response was to programme the workaround: techniques that simulated the missing circuits from within the code itself. He sampled Roland TR-808 and TR-909 drum machines — the same hardware shaping nightclubs in Tokyo and London that year — and combined FM synthesis with PCM sampling in ways the hardware had not been designed to support. The result sounds unmistakably like house music, techno, and early rave on a 1992 game console. Electronic musicians across subsequent decades — across dubstep, grime, and synthwave — have cited the soundtrack as a direct influence on genres that did not yet exist when it was written. The tool had a limitation. Koshiro treated the limitation as the starting point.
— inspired by Yuzo Koshiro
About this game
Streets of Rage 2 — known in Japan as Bare Knuckle II: Requiem for the Raging Battle — is the 1992 Mega Drive beat 'em up developed by Sega with music composed by Yuzo Koshiro and Motohiro Kawashima at their studio Ancient. The game expanded the original's roster to four playable characters — Axel Stone, Blaze Fielding, Skate Hunter, and newcomer Max Thunder — each with a distinct fighting style and stamina profile. The move set was dramatically expanded: special moves, throws, and running attacks gave each character a vocabulary of combat options deeper than most fighting games of the era. Koshiro's soundtrack, composed using music trackers to approximate techno and house rhythms, is considered one of the finest game soundtracks ever produced on Mega Drive hardware.
Key Features
Four playable characters with distinct styles: Axel (balanced), Blaze (speed/combo), Skate (fast, low stamina), Max (power/grapple). Expanded move sets — specials, throws, running attacks per character. Nine stages scaling in length and enemy complexity. Two-player simultaneous co-op throughout. Blitz attack: special move consuming health in exchange for screen-clearing damage. Genre-defining techno/house soundtrack by Yuzo Koshiro and Motohiro Kawashima.
Gallery
The Story Behind
Streets of Rage 2 arrived in December 1992 and immediately became the standard by which all home console beat 'em ups were measured. The original Streets of Rage was strong; the sequel expanded every system so comprehensively that its nearest competitor — Final Fight on Super NES — was immediately overshadowed. Yuzo Koshiro composed the soundtrack using PC-based tracker software to push the Mega Drive's FM sound chip beyond what studio engineers typically attempted, creating dance music rhythms and textures that seemed impossible on the hardware. The game sold over 2 million copies worldwide.
Tricks & Tales
Yuzo Koshiro composed the Streets of Rage 2 soundtrack using a PC-8801 computer and music tracker software — not the Mega Drive's built-in composition tools. This approach let him program rhythmic patterns at a precision impossible through standard methods, producing what sounds like genuine techno and house music on a 1992 game console. The soundtrack has been remixed, re-released, and studied by electronic musicians for decades. Max Thunder was added to the roster specifically to give the game a grappler archetype not present in the original. Koshiro composed the soundtrack using Music Love — a custom programming language he had written himself for the PC-8801 and refined since 1987. The Mega Drive's YM2612 sound chip has no hardware filter circuit; to reproduce the filter sweeps of a Roland TB-303, Koshiro programmed the effect entirely through FM synthesis parameter manipulation. 'Recreating that sound on an FM synthesiser with no filter circuit was a lot of work,' he noted in the soundtrack liner notes. He was 24 years old during the composition.
Collector's Guide
Region & Compatibility
The Japanese Mega Drive and the North American Genesis use different cartridge shapes — Japanese carts have a notch on the side that fits a locking arm inside the JP console, while Genesis carts are slightly narrower with a different profile. The two cartridges are physically incompatible without an adapter. European PAL carts share the same shape as the Genesis. Beyond physical shape, some games from 1992 onward also check a software region register and will lock out foreign consoles even with an adapter. A region converter cartridge or a mod chip addresses both the physical and software locks.
Maintenance Tips
The cartridge edge connector — both on the console and the cartridge itself — is the most common source of read errors on a Mega Drive. Clean the cartridge contacts with a cotton swab lightly dampened with 90% or higher isopropyl alcohol, and let them dry completely before inserting. Avoid blowing into the slot; moisture accelerates pin corrosion. For persistent problems, the console's cartridge slot pins can be gently cleaned the same way using a thin swab.
Going deeper
Explore the machine this game ran on, and what to check before you buy or care for one:
What to Watch Out For
Before buying, these are the points worth knowing — from someone who handles original Japanese Streets of Rage 2 copies regularly.
Will a Japanese Mega Drive cartridge work on a North American Sega Genesis or European Mega Drive?
Not directly. Japanese Mega Drive and North American Genesis cartridges have different physical notch positions, preventing direct insertion without a pin adapter. The console also enforces regional settings in hardware — a Japanese cartridge on a Western console will often lock up or refuse to boot without modification. Playing Japanese Mega Drive software is most reliably done on a Japanese Mega Drive. Region adapters and mod chips exist for those wishing to run imports on Western hardware.
How should I clean a Mega Drive cartridge?
Apply 90% or higher isopropyl alcohol to a cotton swab and wipe the gold-plated edge contacts on the base of the cartridge. Most Mega Drive cartridges use standard Phillips screws if the shell needs opening for deeper cleaning. Clean the console's slot separately — oxidized slot contacts are a common cause of boot failure on Mega Drive hardware.
Before You Buy
Things worth knowing before you buy Streets of Rage 2
A short checklist for buying a used Mega Drive cartridge wisely — useful with any seller, anywhere.
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Choose a seller who tests it before shipping
A copy that has actually been powered on and checked is a known quantity. An untested one is a gamble you only settle after it arrives.
Look for a seller who states it was function-tested and says what they confirmed. A serious seller can tell you exactly what was checked.
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Make sure it fits your console
This is a Japanese Mega Drive cartridge; it differs in shape and region from the North American Genesis and may need a matching console or adapter.
Play it on a matching Japanese console or a region-free system, and confirm the listing states the region.
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If this title saves your progress, check the battery
Cartridges that save use a small coin-cell battery that fades over decades — a dead one wipes your save without warning.
Ask the seller whether the save function was tested. Replacing the battery is possible, but doing so erases any existing save.
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Check that the contacts are clean
Dirty edge contacts are the most common cause of startup and sound trouble in cartridges of this age.
Choose a seller who cleans the contacts before shipping. A note that it was tested and cleaned means the basics were handled.
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Read the seller's reviews and return policy
A 100% positive record across thousands of sales is close to a guarantee — packing, communication and problem-solving all work for everyone. A return policy protects you if something is off.
Read the feedback and confirm a clear return window before you buy.
The last step before buying anywhere is knowing what it's worth.
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