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Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-13, 21:04

I read in some list of ISA sound cards that is floating around Internet that: GMS931601+GMS931600 ROM 4MB sample set, GM/GS, based on 'illegally copied' and later 'licenced' Roland SoundCanvas samples. and further more I read here: https://www.vogons.org/viewtopic.php?p=179287#p179287 The Naming of …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-13, 15:14

And that also explains how they later put that same Waverom in a single chip in newer modules. yeah, and newer (or most likely the last) version of that Waverom is included in "SCCore.dll" from "Roland Sound Canvas VA VSTi Plugin", the date of it is "1994-12-08": https://www.vogons.org/viewtopic. …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-12, 12:35

You said, that encryption was weak, that means, that you would have done this job @ at the beginning of 1990, with no I7 or Ryzen 5000 series. :-) I would say yes, I believe it was possible, because at least what I did, I did not use any modern CPU power to do it. in fact trying to use I7 …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-12, 10:45

@mattw: I wonder, how did you do that great!!! job .... If such "job" will come once again, you should export your permutation-calculations to CUDA :-) actually, in case of SC-88 there was no need of nVidia hundred-billion-transistors chip. just a cup or two of Pepsi to wake me up and couple of …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-11, 20:43

per @Trevor0402 request (because he has some problem converting descrambled SC-88 Waverom to PCM data), I am attaching to this post fast (and ugly) modification of @NewRisingSun posted here: https://www.vogons.org/viewtopic.php?p=914430#p914430 that works with SC-88 Waverom. You need to add WAV …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-11, 12:02

Wow, it took me some time, but I believe I finally fully descrambled @Alex-aut dumps of his SC-88: https://www.vogons.org/viewtopic.php?p=913583#p913583 I am attaching the source code of my "sc88decv2" - the code does the descrambling for IC25 (or is it called IC325?). So, you need to do exactly the …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-10, 22:50

H8/532 CPU that SC-55 use has internal 32K mask ROM that is IC30, I have no idea if it'is involved in any sound-generation, but the other Control ROM , IC23: https://www.vogons.org/viewtopic.php?p=902430#p902430 the actual executable code inside it is less than 32K, everything after those first …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-12-02, 16:53

...VSC.dll and i see a lot of functions... actually, VSC.dll is used in conjunction with the VXD driver (in Win9x) and if you read some of my previous posts, for example: https://www.vogons.org/viewtopic.php?p=904460#p904460 that is much harder to understand and follow. So, using "vscapi.dll" and " …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-29, 20:06

... "alive"... maybe some day someone will make SC-55/88 emulator like MUNT for MT-32 or add support to MAME for SC-55/88 as how CM-32P has support there. So, they can live forever there. I have a functioning roland SCC-1, i ask myself, trying unsolder roms and also make a readout. After readout …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-29, 10:01

totally, scrambled my mind with Roland SC-88 scrambling, really need to take break from it, but just to document that in "S CCore.dll" from "Roland Sound Canvas VA VSTi Plugin", SC-88 Waverom (or whatever "Roland XP-GS 1.01" variant of SC-88 designates, because SC-88 ROM dump @Alex-aut made and …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 15:48

@2FF80 there is: "SC-88 Ver101" yes, but what I wonder, which device is "SC-88 Ver200", because in your ROMs we have "SC-88 Ver101" and "Roland XP-GS 1.00", while in "S CCore.dll" from "Roland Sound Canvas VA VSTi Plugin" it's Ver200 and "Roland XP-GS 1.01". maybe, it's still SC-88, just newer/ …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 15:05

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, 14:58

Yes, your are right, i took a look and indeed, @ 0xFFFFF starts a brand new header yes and what i see in "SCCore.dll" of "Roland Sound Canvas VA VSTi Plugin" - that SC-88 Ver2.0 Waverom there is 8 parts each one 1MB. So, why SC-8820 Waverom is only 4MB I don't know unless, SC-8820 doesn't include …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 13:59

@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, 13:39

OK, new clean slide, with a new finding - it's actually based on very old observation I made about "Roland Sound Canvas VA VSTi Plugin ": https://www.vogons.org/viewtopic.php?p=897911#p897911 when very long time ago I noticed the Waverom data there look totally unencrypted. Now, with SC-55/MKII …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 11:20

mattw :-) your commends are a pleasure but you did'nt lift your secrete in terms of trying the N nth bit, on which pattern do you recognize, that N (in your case '10' as the next bit is the correct bit. what is the trick, that you know, that THIS x is the correct bit ? That would also be wortrh of …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 11:05

Please mattw, allow me to note, that SC88 needs only 20 bit of adressing, because used chip is hardwired in word modus. The adress-bit A0 in this case is used as the data_15 line. The SC88 used ROM 'S can be configured in byte- as well in word mode. In the schematic the ROM's are used in word-mode. …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-28, 08:48

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*17 …

Re: About Roland Virtual Sound Canvas 3

Posted on 2020-11-27, 22:28

When the bit about address lines came up and service manuals schematics were posted I had a look at the JV35/50 service manual to see whether that would be of any help, since JV35 and JV50 are basically the SC55Mk. II ROM (minus MT32 part) on SC88 hardware. Unfortunately on that synth the ROM is …

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