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We are literally streaming audio into the NES.'Īt Geekpwn, Cecil says a stream of a popular Chinese folk song 'totally blew people away. This mechanism uses 'every ounce of computational power available to shove that data at the sound processor as fast as we possibly could. This method uses what Cecil calls 'a bizarre encoding mechanism,' designed by TASbot team members total and Ilari. 'īut with TASBot taking total control of the system (and bootstrapping a Commodore 64-style loader payload), complex sound files from the computer could be converted to a 7-bit PCM and sent almost directly to the APU as 52 khz mono audio via the controller ports.

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'No one ever really used the audio chip to its full capability because you couldn't fit anything. The NES can play back much lengthier and more complex sound samples, too, but 'you could just never store that on a cartridge,' Cecil told Ars. Some games take advantage of this through extremely short samples, such as the steel drum effect that runs in the background of some Super Mario Bros. Why not?ĭespite the NES' reputation for retro-style 'bleep bloop' game audio, the audio processor inside the system is actually perfectly capable of outputting high-quality, PCM-encoded audio. To finish things off, the TASBot team lets Twitch chat fill the SNES screen with emotes. That's where Cecil first presented a method for streaming high-quality audio through the NES sound chip after total control has been achieved. To unwind how the TASBot team 'played' relatively modern games through 25-year-old SNES hardware, we need to go back to China's Geekpwn hacking conference a few months ago. No one on the AGDQ stage acknowledged how weird this all was, leaving hundreds in the Herndon, VA ballroom and nearly 200,000 people watching live on Twitch temporarily guessing at what, exactly, was going on. After that, the scene somehow transitioned to a Skype video call with a number of speedrunners speaking live from the AGDQ event through the SNES.

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After a few minutes of setup, the Zelda screen faded out, then faded back in on a bordered window with an ersatz logo for the 'Super N64.' Without any forthcoming explanation from the runners on stage, TASBot started apparently playing through a glitch-filled speedrun of Super Mario 64 on the Super NES, following it up with a similar glitch-filled speedrun through Valve's PC classic Portal. With those out of the way, TASBot moved on to a similar total control run of The Legend of Zelda: A Link to the Past. 3 in less than a second with a very specific total control glitch.

The method was taken to ridiculous extremes last year, when TASbot managed to 'beat' Super Mario Bros. This is nothing new for the computer-driven TASBot-the basics of the tricks vary by game, but they generally involve using buffer overflows to get into memory, then bootstrapping a loader that starts reading and executing a stream of controller inputs as raw assembly level opcodes.

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3 and Mega Man to insert arbitrary code on the NES. 3 in less than a secondAfter that, TASBot moved on to a few 'total control runs,' exploiting known glitches in Super Mario Bros.

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Further Reading How to beat Super Mario Bros.

Gradius rebirth 1.2