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 Post subject: SP-303 DSP Reverse Engineering Crusade
PostPosted: Thu Mar 14, 2019 2:21 am 
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Anyone interested in being part of my crusade to reverse engineer the SP-303 effects DSP algorithms? I extracted a binary image of the firmware/OS for a 303 (forum won't let me attach the file format but I can email it to you). I'm planning on building up a grammar for said code to deconstruct the DSP portion. Long term goal would be to build a standalone effects unit that uses the original algorithms and DAC architecture. I love these little magic boxes, and use them almost daily in my own music stuffs. I know it's a bit of a silly project, but I've reverse engineered more challenging devices before. I'm an electrical Engineering student studying in California.

To move forward I'm thinking I'll need an original service manual to find the specific CPU/DAC chips being used, RAM/bus information, and DAC filter/preamp schematics.

Once I have the CPU chip nailed down I should be able to track down an op-code list and work from there on the firmware/kernel hex.

If it sounds like a project you're interested in being part of or can help out with DM me! It's a pet project at the moment but I'd love to shoehorn it into a college CPE project if I make some progress.

Got high-res pictures of the CPU board chips??


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 Post subject: Re: SP-303 DSP Reverse Engineering Crusade
PostPosted: Sat Mar 16, 2019 10:14 am 
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Here is the Boss SP-303 service manual.
http://www.nquabayre.com/wp-content/upl ... Manual.pdf

I have a sp-505 open right now (basically the same as the 303) not sure what pictures of the chips are going to do for you but I will take them if wanted.

The only sought after algorithm of the sp 303 was the vinyl simulation "vinyl sim" which has already been created in a software format for the same price as buying a 303 or sp-505.

I commend you for your crusade, but if anyone wants an effects box from roland......They already have it and have signed up on the forum.

Good luck


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 Post subject: Re: SP-303 DSP Reverse Engineering Crusade
PostPosted: Sat Mar 16, 2019 8:03 pm 
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You pose a fair point about the effects unit argument. Thank you for the service manual! I'll probably dig into it a bit more knowing what DSP chip is used. I had no idea someone had actually reverse engineered the vinyl-sim, I was under the impression they were all constructed somewhat arbitrarily on the sound rather than the original code.


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 Post subject: Re: SP-303 DSP Reverse Engineering Crusade
PostPosted: Wed Jun 05, 2019 7:17 pm 
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gym_prof wrote:
I had no idea someone had actually reverse engineered the vinyl-sim, I was under the impression they were all constructed somewhat arbitrarily on the sound rather than the original code.


I was always under this impression too.

Is this in reference to Vulf Comp or is there something else? Personally I'd love to see it available as a plugin for iOS devices but I've just bought a 303 to solve that issue the long way round :wink:

I'm totally down to help if I can, although I'm not sure in what capacity I would be of use.


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 Post subject: Re: SP-303 DSP Reverse Engineering Crusade
PostPosted: Fri Jul 19, 2019 6:22 pm 
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To the OP...

This sounds like a great project. Does your expertise extend to understanding the language of the OS, and potentially modifying it to add functionality in an updated version?

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 Post subject: Re: SP-303 DSP Reverse Engineering Crusade
PostPosted: Sat Jul 20, 2019 12:52 am 
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has the vinyl sim really been reverse engineered? like exactly?? which software?
that algorithm has always left me dumbfounded, shit is so perfect but i have absolutely no idea how the fuck it works

-edit-

also has anyone reverse engineered the 404 equalizer? curious what kind of curve that shit does, i love it

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