TK. Posted June 22, 2003 Report Posted June 22, 2003 See MBHP->MIDIbox SID->Step B and Step C for further details. :)Best Regards, Thorsten.
stryd_one Posted June 22, 2003 Report Posted June 22, 2003 Man, Thorsten is so fast, I can hardly type "Thanks Thorsten!" before I feel I need to type it all over again! ;)
Captain_Hastings Posted June 22, 2003 Report Posted June 22, 2003 exciting times... ;Dgonna be soldering my dual sid board today! yippey! ;)
Stigmata Posted June 23, 2003 Report Posted June 23, 2003 Can´t wait to start build again...Right now i´m middle of changing flat so everything are in boxes..(Not midiboxes) ;)But now I have something to look forward to. ;DChristoffer
TK. Posted June 23, 2003 Author Report Posted June 23, 2003 Thank you! :)I've good news: I found out the trick how the original C64 power supply unit shifts the 9V AC to a higher voltage level in order to power the SID. It just adds the 5V DC via a 1N4001 diode - this DC voltage is not used to power the C64 logic...Schematics can be found here:http://www.ucapps.de/mbhp/mbhp_sid_c64_psu.pdfhttp://www.ucapps.de/mbhp/mbhp_4xsid_c64_psu.pdfNote that the ground connections have to be wired like shown above in order to avoid 50 Hz buzz on the Audio Outs.Next step will be the integration of 4 Audio Outs, a USB plug and a second MIDI In/Out into the C64 case... ;-)Best Regards, Thorsten.
bosone Posted June 23, 2003 Report Posted June 23, 2003 i don't know if this is already asked... but is there the possibilty for you, (in the future) to implement a "Multiple SID" unit controlled by only one core?
TK. Posted June 23, 2003 Author Report Posted June 23, 2003 Hi Matteo,possibly yes - I've programmed the MIOS based firmware in a way which allows me to use all algorithms with multiple databases, so that another SID could be driven in parallel - in theory. But in practise I expect some effort for the details. First I want to finish all the planned features and projects before I do such a step.From my personal point of view this is a low-priority taskEvery additional core module just only costs about 20 EURAs I already built the 4-core solution, I don't need it for myself, it would only be some kind of sport to demonstrate the power of the PIC18F... A PIC18F core which drives 2 SIDs will not be able to handle the control surface in parallel (due to RAM limitations). And controlling SIDs without the control surface makes no fun. So at least two cores would be prefered anyhow.So in fact, please don't expect a release this year.But if somebody else with programming skills would like to modify the application for this option - step forward :) (I can provide some more technical details if required) Best Regards, Thorsten.
pay_c Posted June 24, 2003 Report Posted June 24, 2003 Fast, faster, TK!!!Just build the case this weekend for my 4xSID and designed the frontplate in advance.Coming back here: Tadaaa! Man, thats timing. Really BIG thnx!!! (again... Â ;D)/edit: Am I right that the open DOUT Pins are just multiplexed for the LEDs of the Modulation Matrix? Just cant wait to solder that stuff...
TK. Posted June 24, 2003 Author Report Posted June 24, 2003 Yes, the last two shift registers of the DOUT chain are reserved for the modulation matrix. I just have added the 56 LEDs to the schematic (I've a nice animation in mind which could be showed during the startup phase ;-))http://www.ucapps.de/midibox_sid_cs/mbsid_dout_default.pdfBest Regards, Thorsten.
d2k Posted June 24, 2003 Report Posted June 24, 2003 ;D Rollin!My drill bits have been in overdrive last cpl o days :)
TK. Posted June 24, 2003 Author Report Posted June 24, 2003 *grin* ;-)This is just a link to an article which describes the SID CS handling (so that this info doesn't get lost)http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=news;action=display;num=1056228123;start=15
pay_c Posted June 25, 2003 Report Posted June 25, 2003 For that startup phase:Hehe..... Â "SID rulez" scrolling on those 56 LEDs or what? Â ;D
pay_c Posted June 25, 2003 Report Posted June 25, 2003 Hey, TK: Is there something like a Pan Control planned for the single SIDs? Something digital?If not, I will build some additional analog pots in there to control the pan of every SID (since this is not much additional work). Then I just cant save those settings. And something like a Pan controlled by a LFO or so is always great (especially with 4 SIDs ;D).
TK. Posted July 7, 2003 Author Report Posted July 7, 2003 Pan control will be possible with the AOUT extension :)In the meantime I've revised the PSU circuit for the best signal/noise ratio. No 50/60 Hz hum and no digital HF noise in the background anymore. http://www.ucapps.de/mbhp/mbhp_4xsid_c64_psu_optimized.pdfResults: no heat source within the case anymore, since the +5V are regulated by the external C64 PSU6581: -76 dB signal/noise ratio8580: -90 dB signal/noise ratio (CD quality!)Please don't ask if your own PSU variant brings the same results - it was a long try and error session until I found out this solution ;-)Best Regards, Thorsten.
Steven_C Posted July 8, 2003 Report Posted July 8, 2003 unbelievable! ;D BTW TK, the new mb sid page is very nice, I like Ian's pile of c64's, but I'm not sure if I can cannibalise my old c64 :'(, but then again....BTW, what is wavetable synthesis? is it loading a waveform into the chip or something? (If this requires a long explanation, then just tell me to look on the net somewhere!)
TK. Posted July 9, 2003 Author Report Posted July 9, 2003 Hi Steven,the term "wavetable" is an artefact from the good old C64 days. It has nothing to do with audio samples, but with CC controllers which are played sequently - so fast, that the resulting noise sounds like a new waveform. There is a lot potential in this kind of synthesis, especially when you are able to control any parameter (not only the pitch, the waveform, the sync/ringmodulation switch, but also LFO/envelope/filters and also the wavetable CC assignments and the rate --- really any parameter) like with the MIDIbox SID ;-)Here are four short preset examples:http://www.ucapps.de/midibox_sid/mbsid_wt_demo.mp3First three sound patches: the wavetable rate (speed) is varried from 0 to 119Last sound patch: this is one SID playing one patch - it should demonstrate that wavetables are not only usable for C64 like drum sounds.Best Regards, Thorsten.
Guest Xcen Posted July 9, 2003 Report Posted July 9, 2003 Good work TK :) Very nice panel as well!Can't wait to get home and listen to this mp3 oh and you should switch to OGG :) hehe
gillesdeshays Posted July 10, 2003 Report Posted July 10, 2003 just one little question ...Can we build the SID step C with just only one SID to begin ?the firm will be ok with that ?thanks
pay_c Posted July 10, 2003 Report Posted July 10, 2003 Yes, it will. I built my first part of the SID just with two SIDs and Cores. Everything fine. You can change to SID 3 and 4, but naturally nothing happens there.The first two SIDs worked without problems,
Guest Xcen Posted July 11, 2003 Report Posted July 11, 2003 wow! Just saw the new section on the site!!I want more pictures hehe :DThis is really a cool box, kudos again TK!
d2k Posted July 14, 2003 Report Posted July 14, 2003 Hey T...On the powerfix pdf you've done, I'm assuming thats for the older C64 psu ye?? Can the 8580's be used with the 6581 psu too or is the 8580 wallplug good to be used too (with the 8580s o course)?Reason i ask is cos you've said you had both the 6581's and 8580's working - are you using them with they're own wallplugs, but with the fix as in your pdf?One more thing, are u still running with the 6n8 caps on the 8580's or have you found another value?Great work!Dan
TK. Posted July 14, 2003 Author Report Posted July 14, 2003 Hi Dan,no, an additional PSU is not required for the 6581 and you can also use the C64-II PSU instead of the old one. See also this article:http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=parts_q;action=display;num=1057652794You cannot improve the filters by changing the caps. But MBSID V1.5 will come with a special option for the 8580 which enhances the filter range. In the meantime I've realized that the 8580 filter is better than the 6581 filter - see also this MP3 which has been recorded with a single 8580:http://www.ucapps.de/midibox_sid/mbsid_v1_5_wt+arp2.mp3(MBSID V1.5 Presets, Patch #64 :-))Best Regards, Thorsten.
pay_c Posted July 14, 2003 Report Posted July 14, 2003 But please tell me that this feature will be somehow also available for the 6581. After you said that the 6581 is better, I bought four of them on ebay and now the 8580 is better? *ARGH*
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