SwinSID ATMEGA88

Ok, alles klar...das hatte ich gelesen, wusste nur nicht, ob da noch was anderes zu beachten ist. Was bewirkt eigentlich der Jumper? Ändert der das Klangbild, oder was?

Sehr schön, so habe ich mir das vorgestellt. Da der C64 eh schon nen 8-Fach Kernal hat und einen Umschalter dafür bekommen soll, baue ich da dann auch gleich nen Schalter für den Swin mit rein

Ich hab mit dem Teil jetzt mal ein wenig rumgespielt....ist schon recht brauchbar. Ein guter Test ist übrigens die Demo "Cubase64", da sieht bzw. hört man sehr schön, was geht und was nicht.

Hi guys,

I need a little help.
I want built a NanoSwinSID so I would ask if anybody sells the PCB for it.
Probably it is already indicated in some posts but I dont read german language .

Thank you for any help

Best regards

Antix

Hello.
Since my commodore has damaged the system SID, I want to recreate this project.
What ATmega88 processor will be suitable for this project? I can do it in SMD technology.
At the moment I did it on the contact plate, I used the processor atmega88pa au TQFP package. Yet played

but music is not good. Lack of certain channels, the imbalance volume of the music, no knockout, and

occasional noise in.
I do not know where to look I made a mistake.

google translate.

Well, I just purchased a couple Swinsids and I think they are really cool thus far but I'm having an issue. When running two SwinSid on a Sid2Sid board they sound great together but when I running one with a 8580, I notice that the SwinSid is running at about a semitone down from the 8580. Now, I use Mssiah and there are NTSC / PAL setting for the Mssiah to compensate for PAL vs NTSC machines but not individual chips. Hmm... I'm guess SwinSid's were designed to be used with PAL machines? So, my question is: Is there a work around for this or am I going to be limited to running my second sid (the Swinsid) for drums only? Otherwise, this sounds pretty bad. now, you might think... why not run both SwinSids in one machine? Well, I use a 1351 mouse and SwinSids don't work with them so the first Sid has to be stock. Ideas anyone? X1541? Swinkles?

Thanks, Sean

btw... I hope I made it clear that I am indeed on a NTSC C64. I can get two machines somewhat in tune using 2 Mssiah carts if I set the stock Sid C64 to PAL and the SwinSid C64 to NTSC. But, this is defeating the purpose and making it really hard to tune them to all my studio gear.

Darn, I'm guessing my first thought was right. I think SwinSid haven't been fully tested with NTSC C64s. I tried a 6581 and a SwinSid side by side and the results were the same. The SwinSid was down about a semitone. Bummer

Current swinsid firmware generates sound that is synchronized with 32MHz oscillator, not the C64 CPU clock, so it always plays the same pitch on both PAL and NTSC systems. 32MHz clock is divided to get 1.0 MHz base frequency used to update pitch registers, while PAL SID is clocked at 0.985 MHz and NTSC at 1.02 MHz. This is the reason why it sounds a little bit out of tune when comparing SwinSID to SID. It is not a big deal when listening to music or playing games but this may be a problem when using SwinISD with other instruments or real SID.
There are two method to fix this: One is to change sampling frequency but this will give a little bit of aliasing effect. And the second method requires more CPU power to recalculate pitch value.
@dJ dAb: I can send you fixed firmware with samplerate fix included so you will be able to test yourself how it sounds (i didn't test this method yet).

Quote from Swinkels

Current swinsid firmware generates sound that is synchronized with 32MHz oscillator, not the C64 CPU clock, so it always plays the same pitch on both PAL and NTSC systems. 32MHz clock is divided to get 1.0 MHz base frequency used to update pitch registers, while PAL SID is clocked at 0.985 MHz and NTSC at 1.02 MHz. This is the reason why it sounds a little bit out of tune when comparing SwinSID to SID. It is not a big deal when listening to music or playing games but this may be a problem when using SwinISD with other instruments or real SID.
There are two method to fix this: One is to change sampling frequency but this will give a little bit of aliasing effect. And the second method requires more CPU power to recalculate pitch value.
@dJ dAb: I can send you fixed firmware with samplerate fix included so you will be able to test yourself how it sounds (i didn't test this method yet).

Swinkels, that sounds great! I knew you would have a solution. If I can get it tuned right. I'd love to add a few more SwinSids to my collection (I have 8 C64s) It is a great little device and you've done a great job!!! btw... I purchased mine from the Retro Donald site. Is that the best way to go? Also, how do you update the firmware? Do you have to physical send something to me? Or is it uploaded to the ATMega88 somehow on my 644 or via a PC/Mac?

Here's my email. Please get in touch and thank you for your response, Sean

dab@blarg.net

www.facebook.com/djdab

Update: Swinkels is sending me different firmware to work with. I need to assemble a STK200 programmer but it's super simple. Just a DB25 port, a few resisters, a 6 pin header, attach the device to my LPT port and upload the firmware via PonyProg software. Luckily, I have parts laying around.

I must say I'm impressed with Swinkels support. Very Cool!!! Thanks Swinkels!!!

Unfortunately this is a limitation of the current SwinSID firmware. There is a chance to fix this but it is really hard.