drsyncenstein

Hi Seppo. I was just reacting to what i read here, because i had the impression someone else was interested. I've got 4 pieces of 3372 waiting, but if i build multi mode out of it, the filter board alone will probably be bigger than the core and sid together. Not to mention the extra logic that would need to be hooked into the software. A quad filter and vca board for the MB-6582 might be interesting, but i guess they'd have to find another case to fit it ;D

One of the post mentioned that My preference right now (already given away above!), even though it is ONLY a 4-pole lowpass (no other modes possible) is the SSM-2044 But nearly any 4 pole vcf can be a multimode filter, there is nothing in the 3372 that makes it somehow into a multimode filter. If you build a vcf from a SSM2044 or 2164 you could make it in a multimode filter the same way as any other 4 cell ota\vca\vcf chip. An example can be seen here: http://m.bareille.free.fr/modular1/vcf_multimode/extrapole.htm It also has a link to the Oberheim Expander service manual which explains the theory behind it. If you would like to build a nice filter, also look at this svf: http://musicfromouterspace.com/analogsynth/STATEVARVCFFEB2006/STATEVARVCFFEB2006.html

Overall, the first layout is more clear. I like the fact that the text in the second mockup is on a label, but i think the slant doesn't look nice because there is a line above it that is not always the same length. I would keep the label, but remove the slant and the line above it. It would look cleaner if this label was the same size everywhere, but you'd probably have to abbreviate some names. Oscillator could be osc for example. I added a pic to explain what i've written here. sid.JPG

Great, all connections nice on a row, not crammed as the original AOUT.

If it's possible 1x blue negative (CFAH2004A-TMI-JP), if not then 1 piece of your original choice.

Very Nice. Any old prophet or oberheim would wish it had such a good dac. Would be nice if they could be daisy chained though.

Thanks for the replies. I think Seppoman meant the droop rate, not the slew rate. I had not noticed that, but the performance of the nju is indeed 10 times better. Never trust a data sheet that says Low Droop Rate! So you are probably right, it's not a good chip for this. But as i cannot find the nju part, i need an alternative. I like the multiple dac idea, but i really need those 64 voltages. I'm reluctant to go the 4051 route, but maybe that would be the easiest. I'll try some more part browsing for now.

I posted about the shx8 problem in another thread, but have not yet found a response. So i'll repeat it here: I stumbled upon a comparable chip from Analog Devices, the SMP08 (or SMP018): http://www.analog.com/en/prod/0,,773_925_SMP08%2C00.html The truth table is the same as and it's an all in one chip like the nju. It is not cheap, but not much more expensive than the nju either. With my limited knowledge it looks like a good replacement. So if the knowledgeable people here agree, i would try it out and do my best to do a pcb design around it. Browsing for parts it seems that there are lots of solutions that combine a dac and a multiplexer with s&h. But there do not seem to be many nju - like solutions around.

Since i'm not able to find the nju7403 chip i'm also looking for an alternative chip to build a SH8X module. The 4051 multiplexer route should work fine, but it is a lot of parts to build; 8 multiplexers plus an opamp and cap for each of the 64 cv's. I stumbled upon a comparable chip from Analog Devices, the SMP08 (or SMP018): http://www.analog.com/en/prod/0,,773_925_SMP08%2C00.html The truth table is the same and it's an all in one chip like the nju. It is not cheap, but not much more expensive than the nju. Anyone ever tried this or can give me a clue why this would not work as a direct replacement (except for the pin layout)?

cloned cem3310 adsr's with a pic: http://www.tomwiltshire.co.uk/sdiy/envgen.html

Hi, It's pretty normal for a 6581 to get hot. There are some items about it in the forum, for example: http://69.56.171.55/~midibox/forum/index.php?topic=805.0 http://69.56.171.55/~midibox/forum/index.php?topic=239.msg1180#msg1180 kind regards, Stefan

Die vfd komt van ebay, meestal gaan ze voor twee tientjes weg. Die vfd van mij doet het als een speer, behalve dat de sid geen geluid geeft in combi met de vfd driver. Tenzij je een betere programmeur bent dan ik, dan zou ik even wachten tot dat gefixt is.

hello, The midibox sid uses rotary encoders instead of potmeters. You do not need ainx for that. Controlling 4 sids is done by building a control surface. You should read step a, b and c here: http://www.ucapps.de/midibox_sid_cs.html kind regards.

Hi DragonMaster, I have no experience with a midi link, but if it gives you midi out, it should work. But if you have to buy a midi interface, it might be better to go for usb nowadays, for example: http://m-audio.com/products/en_us/MIDISPORT1x1-main.html I do not know if the ltc would work, it probably would if you have drivers. Search the forum and see if it's been done. There is a reason that midibox uses midi, that is, it started out as a midi controller. Because of midi, you can connect midibox sid to almost any modern keyboard and play it. kind regards, Stefan

Hello Thorsten, I forgot to say that i use the c64 supply. But i measured all supply pins of the pic and bankstick. They are a bit above 5 volts. To be sure, i uploaded the standard 1.7a code and made sure i could play sid and that the presets worked. Then i connected the vfd display and i could still play sid and use presets. When i upload the modified code, its is like hello vfd and goodbye patches\sid. So i don't think it's the supply. kind regards, Stefan

hi, All mios applications, including sid are midi based. So the only way to use the sid is with a midi interface. How else would you be able to play it ::)

Hello, I have a strange problem using a bankstick and a vfd attached to my core\sid. When i use mios 1.8, midibox sid 1.7a and a standard 2x40 lcd the bankstick and display works flawlessly. With the vfd attached and the driver loaded, the bankstick is not recognized, i can only see the same internal patch. The vfd driver is the one that's written by seppoman, he's been very kind in helping me with this. His display is the same type. The only changes to the code i made are: - a different app_lcd.inc - these lines in main.asm, added immediately below USER_Init: ;; select LCD type #7 (custom LCD driver, hooks in app_lcd.inc will be used) clrf MIOS_PARAMETER1 ; variable enable pin not provided clrf MIOS_PARAMETER2 ; variable enable pin not provided movlw 0x07 call MIOS_LCD_TypeSet With those changes the vfd display itself is working fine. Today i tried different combinations of code: mios 1.6,1.7,1.8 and sid 1.6 For the sid 1.6 software, i used sid_init.inc, instead of the extra lines in main.asm I also checked the hardware connections. To make it worse, i have 2 cores, (made from pcb's from mike's shop) and both show the same behaviour. Needless to say that my mind is in a bit of disarray! I hope any of you have a good suggestion. Stefan

Heb net iets over vfd gezegd in andere post, ook van Seppoman dus. Is ook hetzelfde display. Polyvoks filter ken ik niet, heb je daar een schema van? Heb zelf geexperimenteerd met de steiner filters van cgs.net. Wil eigenlijk een soort oberheim expander maken van de sid. Heb daarvoor dezelfde curtis chips in huis, voor elke sid 1. Mooie van dat filter is dat er standaard al 15 verschillende types mogelijk zijn (van 1 pole lpf\ p4 lpf\ 3p hpf, 3p bpf enz). Doepfer heeft er zelfs 32 uit weten te halen, maar ik ben er nog niet uit hoe. Die filters gaan wel lukken, maar ik zou graag de settings ook in de eprom opslaan. Van wat ik tot nog toe van de sid software gezien heb is dat niet echt makkelijk.

Hee grappig, ik heb zelf de vfd driver van seppoman gekregen. werkt op zich prima, alleen de bankstick doet het nu niet meer..

OnAcid; Ik zie verschillende interessante posts van jou in het forum staan over aanpassingen in de code. Ben nieuwsgierig, ben je helemaal blanco met die tutorial begonnen, of kon je al een beetje programmeren?

Staat bij mij ook een quad sid die qua hardware af is. Wil er nog mooie filters achter hangen en ben bezig met vfd display. Even wachten wat er met die aout optie gaat gebeuren.

Hello Logo, i did not say you should not try :P

A core + aout + shx8 + bankstick would be perfect as a building block for programmable analog synths. I'm drooling when i think about it. But the problem is, building the electronics is so much easier compared to writing the software, that iguess very few midiboxers are able to code this. C might be an improvement for some, but personally, i have enough trouble with basic! So i'm a bit pessimistic about a library :(

have you seen this schematic ::) http://ucapps.de/mbhp/mbhp_4xsid_c64_psu_optimized.pdf

the bootstrap should send out a message when the core starts, so that seems to be working. it will keep sending until it has completed the mios upload. i do not use midiox, so i'm not sure why you see it also in the midi out. that should not be happening. maybe you should turn midi thru off. or there is something wrong with your midi connections. if you are sure that everything is ok, then you should try serge's syses loader, from OnAcid's post. it is simpler to use.