VOGONS

Search

Common searches

Search results

Display options

Display options

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-03, 19:34

I didn't expect this - it took me no time to find Demo/Trial version of VSC-88 v2.1a using Google, the file is called: "TVSC8821.EXE" and even more surprising Roland released version of it for Macintosh as well: "vsc88-21-trial.sit". However, it seems "TVSC8821.EXE" is Win9X only, i.e. v2.x …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-29, 19:26

@mattw, i am very impressed of you work, it is stunning. All these progress, without logic-analizer, but human thinking an combining. Great! These "Game" looks for me, that you got a SUDOKU to solve, with only 2 numbers and you solve it. At the end i would like to write a little sumary about all …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 15:13

I will check the readout once aagain, the two headers in one ROM makes me nervous I think no need to check, it's correct for sure based on what I see inside the"S CCore.dll" from "Roland Sound Canvas VA VSTi Plugin" - the SC-88 Ver2.0 Waverom there is structured the same, 8 parts each with size of …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 14:34

@mattw, exuse me for my dumb writing, because i assumed, that data descrambling was already done, my idea is therefore obsolete :-( See my post above - I found fully decrypted Waverom of what seems to be SC-88 Rev 2.0 from 1994 your SC-88 Waverom is from 1993 and for it, data value decoding (8-bit …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 12:47

Hmmm, thank you for your great explanation. Ok, if we assume, that for given example the TR808 samples are the same in SC55 as well in SC88, we could make following adäquate konklusion: Why should roland take the affort, to sample TR808 samples a second time for the SC88? Taking samples costs money, …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 11:11

finally, I got understanding why I was manually able to guess first 10 bits of SC88 address line scrambling almost without effort, I just wasn't able to define what I am actually doing and why it's so efficient and I am able to do it by hand, i.e. that it doesn't obviously require (22*21*20*19*18* …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 10:50

@all, i am very sad 🙁, the adress line decryption looks good for SC55 ROM 's, i am shure, that data line decryption is also good. Loaded the dectypted 3 files stored as one file is now clearly listable - instruments are now recognizeable - and i can hear, that adress-lines are fine. But useing the …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 10:43

OK, I made an observation, that probably most of you already did notice, because it's so basic and simple, but I haven't noticed until now: single chip CM-32P Waverom size: 524 288 bytes, that means address 0x0000 to (524 288 -1) =0x7FFFF = 111 1111 1111 1111 1111 or (3 + 4*4) = 19 bits, hence we …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-27, 21:17

Well done!!! :-) it's a small progress, but it seems I found out first 6 bits of the address line scrambling used on SC88 "13, 1, 3, 2, 4, 0", which means I reduced from 20-bit strong scrambling to 14-bit, which is easier for brute-force, but still is a lot. in any way I guess main point is that …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-27, 20:51

... someone with more vivid imagination (or some math correlation) can figure it out.... played manually with trying different permutations and this one: BITSWAP20(_offset,19,14, 18,12, 5, 16,8,11,15, 7,17,10,6,9, 13, 1, 3, 2, 4, 0) makes data on address 0x20 to 0x30 for each SC88 ROM chip decode …

Page 2 of 3

Go to top of page Go to top of page
Close window
Close window