The CPU inside the VCI-100

[barf]

if i'm studying informatics, wtf r u ?

[Fatlimey]

if i'm studying informatics, wtf r u ?

It's just basic low-level hacking. You try to understand a block of memory from the processor's point of view. You start with the entry point and look for Jump and Return commands, use this to break the source into subroutines, then for each subroutine try to understand what it does, specifically what it's side effects are. What parts of memory is it writing to, what parts is it reading from? When do the IO pins get written to and read from?

You're building up a map of what each block does, inexactly the same way you would explore an unknown territory. There are a few key instructions to search for that control IO pins, send standard USB messages and reset the Analog-Digital converter and we can use these as landmarks. We then search outwards from these. We know it sends MIDI commands, so we need to find out where these are generated and where they are sent out. We know that certain MIDI messages turn on lights, so there has to be some storage used for these, we need to find the data structure that holds these states.

I guess they don't teach low-level reverse engineering these days. Too "dangerous". It's the same techniques that crackers use to chase down copy protection code, or virus writers use to find interesting places to hide their payloads.

Go learn some assembly code, my friend. It will set you free!

P.S. Anyone want to help? The ultimate goal is to recreate the effect of this code in C, then extend it.

[sgb]

The 1.2 firmware might be better to hack on because it should have less subroutines than 1.3.

http://www.zshare.net/download/17369358d7406a37/

[Fatlimey]

The 1.2 firmware might be better to hack

The filename says v1.02, but thanks. Good idea!

[midifidler]

Fascinating work!

My knowledge of assembler is minimal, but Ill help out where I can.

Vestax should really release the source though, they must realize by now they have a future classic in their hands, by being the first major company to release source, even to a select few developers they will cement that.

[Krilikz]

What do they really have to lose for giving that information out?

that wouldnt be copyright infrindgement(or something like it) would it?

[obsidiance]

Fat Limey you are the man! I could probably help out with some C work down the road but i haven't dabbled in Assembler before. Exciting stuff though!!!

(WORD UP THE NERDS!!!!!!)

[BentoSan]

Whoa i got some sleep and went to work and get back to find you guys are all over this Sweet !

Fascinating work!

My knowledge of assembler is minimal, but Ill help out where I can.

Vestax should really release the source though, they must realize by now they have a future classic in their hands, by being the first major company to release source, even to a select few developers they will cement that.

You are so very right, the Ean Golden SE is just a taste of what could be.

Time to start decompiling this baby

[BentoSan]

Here's a disassembler, plus a handy "s2bin" application that reads the .mot files and converts them to binary files.

H8 Disassembler: dasmh83.zip

[/code]

Your a legend i was looking for something like this last night but had to goto bed, you know your stuff way better than i do but ill help where i can and hopefully learn some stuff along the way

[tekki]

I am no big fan of dissasembling assembly.

But if needed, I can try to help out?