Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-17, 19:59
Caps C51 C52 exploded on desoldering, but this will not be a problem
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-17, 19:57
@Mattw: I did the readout on SCC1 Control ROM, and yes, it is byte-exaclty the same as kitrinx SCC1A_R00128567_GS4-PRM_v4_(program).BIN. Resoldering was successful, but i am not shure, to do such a hazard again 😀
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 20:45
@mattw: hi mattw, i am very sorry, because i red out the first SCC-1 ROM_A, and what can I see is only gabagge. I cannot recognize any structure, nor at the beginning something like "Roland... bla la". I soldered th lines very very carefuly, i will check the lines tomorrow again :-( Not like other …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 20:15
Pleaser @mattw, check it for correctness, so that i can continue with the other 2 and than the control-rom. Thank you so much!
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 20:14
Header is now readable
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 20:13
@mattw: badass, you where right. I messed up the whole Port F, because i did the read out with atmega2561, and 4 bits of Port F i used as 4 data and the other 4 as the ms 4 bits for adress. So please check it out 😀
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 18:01
@mattw: will check adress line 17 after dinner
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 17:03
Ok, i red out the rom_a 3 times at very slow speed , red the output data 2 timers per adress and the attached file is identical to all read attemps. So the gabage will not be better. I will check the adress-line soldering, perhaps i mixed lines, but this should not be happened. 🙁
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-16, 15:30
@mattw: hi mattw, i am very sorry, because i red out the first SCC-1 ROM_A, and what can I see is only gabagge. I cannot recognize any structure, nor at the beginning something like "Roland... bla la". I soldered th lines very very carefuly, i will check the lines tomorrow again :-( Not like other …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-15, 18:56
@kitrinx, @newrisingSun and all others :-) crazy guys are here:-) sf2 works :-) sometimes i think, your former employee was Roland :-) Thank you so much for all the work. Compiler under windows compiles even with noted compiler options with a lot of warnings, but at the end, sf2 is created. …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-15, 10:39
@mattw: So let us pray, that resoldering will also be successful. As you can see, desoldered ROM's from SCC-1 + desoldered Control ROM. a 74 was comming within desoldering, 3 caps are exploded (3 x 100nF) but his will not bee a problem, standard 805 caps, fine to solder. Ok, now i am making proto …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-12, 11:55
@mattw: Thank you so much for this very great summary!!! It is a pleasure to read this stuff even several times. Most explanations are sounding, that "sharp eyes" for data structure is one of the most importend things, that is needed in this work. You said, that encryption was weak, that means, that …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-12, 09:08
@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 😀
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-12, 09:05
@mattw: I thank you so so much for your work!!! I cant belive, that my dream comes true, build a synt with the original SC 88 waves. I am very grateful for your work, and of course of other work too. Thank you so much!
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-06, 12:01
Thank you for the detailed explanation. Does the H8's limited calculation abilities also explain why the encryption Roland used is fairly weak? Point 2) makes me wonder about something. The SC55 and similar have a second LFO that is accessible only via sysex. From your explanation, the H8 would …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-05, 10:02
@yawetaG: I guess, that most of us are interessted to reproduce accurate sounds of SCC-55, SCC-88 (pro), SCC-1 and so on. Therefore we have to know (to get): 1.) Wavetable (knowing root-key, start adress, length, start of loop, end of loop, (is looped), involved tones, note-range for linear …
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-04, 21:12
of course H8 is handling second uart chip and LCD-Display handling
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-04, 21:06
nukeykt wrote on 2020-12-04, 20:54: H8/532 CPU that SC-55 use has internal 32K mask ROM that is true, but in this 32K the MIDI interface is implemented. On service notes of sc55 the H8 is not involved in sound-generation.
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-04, 20:47
nukeykt wrote on 2020-12-04, 20:25: Did anyone manage to dump internal SC-55 cpu ROM? SC-55 cpu ROM Firmware is IC23. We are struggeling with the structure respective wtih coeff. bytes . @mattw has already done great work on it, but hole structure is still unknown.
Re: About Roland Virtual Sound Canvas 3
Posted on 2020-12-04, 20:21
JNZ = opcode = 0x75, JZ would be opcode 0x74 @ fileoffset 0x1306h in vscapi.dll. you can also check section "F. Manually Update Trial version...", here: https://www.vogons.org/viewtopic.php?p=895413#p895413 ok :-) got it :-) i didn't read this F. topic .. you said, i should do a look into this …
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