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 Forum index » DIY Hardware and Software
Any C64 SID projects out there?
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Tue Jan 06, 2009 2:40 pm    Post subject: Any C64 SID projects out there? Reply with quote  Mark this post and the followings unread

I loved my Commodore 64 back in the 80s, and still love the sound. I was wondering if a C64 SID project has ever graced the forum?
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b-funk



Joined: Jul 17, 2007
Posts: 193
Location: Berlin

PostPosted: Tue Jan 06, 2009 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

I don't know about any projects here at electro-music, but maybe you want to have a look at ucapps.de... Scroll down for the MidiBox Sid v2... This sure is the most powerful SID synth ever...

Best wishes,

Tobias
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Tue Jan 06, 2009 5:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is a picture of my Mini64, a MIDIbox SID V1.
(from http://www.ucapps.de/ of course).


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Sebo
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Tue Jan 06, 2009 9:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

They look amazing!

However, what I had in mind was more along the lines of a DIY module with a single SID chip.
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Wed Jan 07, 2009 5:27 am    Post subject: Reply with quote  Mark this post and the followings unread

LektroiD wrote:
They look amazing!

However, what I had in mind was more along the lines of a DIY module with a single SID chip.


That's exactly what my Mini64 is: a DIY synth with a single SID chip.
In the MIDIbox SID V1 you can choose to build the synth with 1 to 4 SID
chips.
In version 2 you can choose between 1 to 8 chips.
Also you can choose how simple/complicated the user interface will be,
from nothing (you can control everything by MIDI) to a full UI with an
encoder for every parameter.
Mine is a intermediate UI.
Go to http://www.ucapps.de/ you can see all the details there.

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strategy



Joined: Jan 03, 2009
Posts: 87
Location: portland, oregon

PostPosted: Wed Jan 07, 2009 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

I hadn't considered this project because I thought it would be too advanced for me (might be) but the scaled back version really appeals.

One question is I have several non functioning C64s, I've been saving them to rescue the SIDs and other components. Is there a chip testing protocol for these to make sure they're not fried?

I'd be more likely to go for this project if I knew the SIDs I have work...
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Wed Jan 07, 2009 2:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi strategy:
I don't know what is advance for you, but this project is intermediate, I
think.
The hard part is to burn the bootloader in the PIC, you need a burner to
do that. Today burners are cheap and you can use it for a lot other
projects. Or you can buy a pre-burned PIC. Also you can buy the PCBs
and parts kits. Or etch the PCBs yourself.
So in the end if you buy the pre-burned PIC, PCB and parts kit, is pretty
straightforward.
There is no way to check the SID until you have the Synth up and running.
Or you can check them in a working C64.

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strategy



Joined: Jan 03, 2009
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Location: portland, oregon

PostPosted: Wed Jan 07, 2009 2:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Sebo thanks for your comment. By advanced I mean: most projects I've worked on have not had digital elements like PICs, MIDI, etc. I'm working on mainly kits for purely analogue synth modules, noise makers, etc. - starting simple and working my way up Very Happy

I did see how friendly the kits are and so I have ordered part of what I'll need...

With any luck at least 1 of my 3 SIDs will be functional, if not then I'll find one!
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Sebo



Joined: Apr 27, 2007
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Location: Argentina

PostPosted: Wed Jan 07, 2009 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great!!!
You won't regret it. I used the MB SID in almost all tracks of the new
album of my band, I love it.

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strategy



Joined: Jan 03, 2009
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Location: portland, oregon

PostPosted: Thu Jan 08, 2009 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sebo:
What solution did you use for the powersupply?

The doc's recommend cannibalizing an original C64 PSU, but these are very old and have problems- which can lead to damage, even, of older Commodore original CPU's...It seems it's complex to power both the CORE and the SID modules without complexity- what was your solution?
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filterstein



Joined: Mar 17, 2007
Posts: 42
Location: The Netherlands

PostPosted: Thu Jan 08, 2009 1:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you need sid chips, just sign up for the mega sale;
http://www.midibox.org/dokuwiki/doku.php?id=wilba_6582a_sid_mega_sale
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Sebo



Joined: Apr 27, 2007
Posts: 564
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PostPosted: Thu Jan 08, 2009 5:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

For the PSU I stuffed the componentes in the CORE PCB and the SID PCB,
in both there is space to fit the diode bridge, capacitors and regulators
(7805 in the CORE and 7812 in the SID).
Then I wired a 7.5V 500mA to the CORE and a 15V 300mA to the SID PCB.
Previously I tried with a 7.5+7.5V wiring one half to the CORE and the
extremes to the SID PCB, but I got humming in the audio, but could
be the CORE was demanding too much current (the LCD needs a lot).

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skrasms



Joined: Feb 21, 2008
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Location: Portland, OR

PostPosted: Thu Jan 08, 2009 8:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sebo wrote:
For the PSU I
Previously I tried with a 7.5+7.5V wiring one half to the CORE and the
extremes to the SID PCB, but I got humming in the audio, but could
be the CORE was demanding too much current (the LCD needs a lot).


Did you use -7.5 and 0 as the half, or 0 and +7.5? The latter would make you end up with two different grounds.

I'm working on a big complicated SID project, but I don't think it will end up DIY-able. It's going to work with a modular synth and have extra little features like sync inputs. Right now it's just for my own sake as it's probably going to cost $500 to make :lol:

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Sebo



Joined: Apr 27, 2007
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PostPosted: Sat Jan 10, 2009 8:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi:
I used the -7.5 as ground (I don't think we can call it -7.5 because is AC).
Left wire from the transformer to both diode bridges, mid point to the
bridge of the 5V circuit and right wire to the 12V circuit.
But again, I think it was a matter of current consumption.

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