Slorrin Posted February 13, 2006 Report Share Posted February 13, 2006 I read somewhere that the 6581 E in the slimline C64C was 9v, not 12v... is this so? how does this affect the midibox sid/ Quote Link to comment Share on other sites More sharing options...
TK. Posted February 14, 2006 Report Share Posted February 14, 2006 Hi,I'm not sure, are you able to measure the voltage at SID pin 28 within the C64? This would be interesting!Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Slorrin Posted February 14, 2006 Author Report Share Posted February 14, 2006 I am, but not at the moment. I suppose, as there no is no 6581 rev E anyway, maybe it was referring to the c64 board rev E, which has the 6581 rev 4 on it (and later the 6582)I will measure the pins at home tomorrow.. then i will tell you what i find. Quote Link to comment Share on other sites More sharing options...
Jurbo Posted February 15, 2006 Report Share Posted February 15, 2006 Correct me if I'm wrong, but wasn't the E board ("short board") only equipped with 8580's? That would mean that the SID socket gives 9 V DC.6581's were used on the earlier, longer board, although housed in a similar newer style case. 12 V DC at the SID socket.Here's a tip: case held together with plastic clips means short board, case held together with screws means older board revisions. Quote Link to comment Share on other sites More sharing options...
thefRont Posted February 15, 2006 Report Share Posted February 15, 2006 i think with 'slimline C64C' you mean the C64-II, right?well, my first C64 war a C64-II with 6581 chip inside. all c64-II had a slim case, but not all c64-II were equipped with a 8580.it's very easy to determine if a c64-II has a 6581 or 8580 inside. just look at the Function-Keys.If everything (F1-F8) is printed on top of the keys, you will find a 8580 inside.If F1, F3, F5 and F7 is printed on top but F2, F4, F6 and F8 is printed on front of the keys, you will find a 6581 inside.Anyway, I haven't measured the voltages yet, but I'm almost sure that all 6581 are 9V only.I will check my C64-II (6581) soon. Quote Link to comment Share on other sites More sharing options...
Slorrin Posted February 15, 2006 Author Report Share Posted February 15, 2006 There is so much inaccurate information out there apparently. Everyone's got a different take on the issue.I thought it was a C64-II, then someone told me it was a C64C, then C64-II again. Regardless, it's the whitish slimiline deal. I opened it up and it's got a 6581 R4, which i haven't tested the voltage of yet. Assuming it's 12 or 9, i will just use the apropriate parts in the midibox.. if it's 9 volts, i assume you can just use the 8550 configuration which is also for 9 volts.. i assume......buuuut.. if not... much sadness. Quote Link to comment Share on other sites More sharing options...
thefRont Posted February 15, 2006 Report Share Posted February 15, 2006 I will check now...hold on... Quote Link to comment Share on other sites More sharing options...
Slorrin Posted February 15, 2006 Author Report Share Posted February 15, 2006 6581 R4! hurray!I have another sid coming from poland... nomatter the results... i'm sure at least one will be normal and 12vs. Quote Link to comment Share on other sites More sharing options...
thefRont Posted February 15, 2006 Report Share Posted February 15, 2006 ok, just checked the voltage and everything...it IS 12Vlook for yourself...this is my C64C (or C64-II as some may call it):another picture from the sticker on the backside:if you open it up, a 6581 R4 will show up:i measured the voltage between Vdd (which should be +12V) and Vss (GND) and it shows aproxx. 12V:now fot the "other" C64C (or C64-II) which has a 8580 inside...as you can see, the case looks the same but the keys are different:the sticker on the backside even looks the same:yes yes, I know, the spot is empty. but beleive me, a 8580 was sitting there some time ago until I took it out to fit it in my Midibox SID:measuring again between Vdd and Vss shows 9V for the 8580:I've never seen a 6581 which only needs 9V instead of 12V. Quote Link to comment Share on other sites More sharing options...
Slorrin Posted February 15, 2006 Author Report Share Posted February 15, 2006 I can only call you "the master" because that's what you are.Thanks so much. I will check mine just to verify, but i feel happy and pleased now.enjoy life! Quote Link to comment Share on other sites More sharing options...
Jaicen Posted February 15, 2006 Report Share Posted February 15, 2006 I don't know if it's important, but the keyboard on the first C64 is indicative of an earlier model. Presumably it was stuffed into a later case during the transitional period. This probably accounts for the fact that i've seen several 'later' type C64's with both 6581's and the later PSU's. Quote Link to comment Share on other sites More sharing options...
ganchan Posted April 25, 2006 Report Share Posted April 25, 2006 i think with 'slimline C64C' you mean the C64-II, right?well, my first C64 war a C64-II with 6581 chip inside. all c64-II had a slim case, but not all c64-II were equipped with a 8580.it's very easy to determine if a c64-II has a 6581 or 8580 inside. just look at the Function-Keys.If everything (F1-F8) is printed on top of the keys, you will find a 8580 inside.If F1, F3, F5 and F7 is printed on top but F2, F4, F6 and F8 is printed on front of the keys, you will find a 6581 inside.Anyway, I haven't measured the voltages yet, but I'm almost sure that all 6581 are 9V only.I will check my C64-II (6581) soon.hi Front, this could be happened for the old c64 too or just for the II? Because there are different print of function-keys for the old style c64 too right?thankyou! Quote Link to comment Share on other sites More sharing options...
thefRont Posted April 25, 2006 Report Share Posted April 25, 2006 hi Front, this could be happened for the old c64 too or just for the II? Because there are different print of function-keys for the old style c64 too right?thankyou!it looks like you mean the C64G. The C64G comes with the old style case but with the same print of function-keys like the new C64c and with a SID-8580.You can see a picture of the C64G here Quote Link to comment Share on other sites More sharing options...
ganchan Posted April 25, 2006 Report Share Posted April 25, 2006 good, that's what i would be hear :)here in italy people sell c64 from 30 to 80 €uros..grrrr italian people are crazy :-\ Quote Link to comment Share on other sites More sharing options...
tarzan boy Posted April 26, 2006 Report Share Posted April 26, 2006 here in italy people throw their c64s away! i've found 3 in the dumpster and 5 donated to the local charity that i picked up free (since i work there) when i see them for sale on ebay its too much, but that is true of any countryi think you just need to know where to look Quote Link to comment Share on other sites More sharing options...
stryd_one Posted April 27, 2006 Report Share Posted April 27, 2006 I stand corrected! Quote Link to comment Share on other sites More sharing options...
tarzan boy Posted April 27, 2006 Report Share Posted April 27, 2006 I didn't mention that there were already 2 c64s that had been sitting there collecting dust for 5 years when i started working there -- and I bought those two. The owner just started giving them to me after that. Only poor immigrants come to the place (looking for clothes, furniture, other non-obsolete things), so if I donate my time to get a few obsolete computers, no harm done! :) Quote Link to comment Share on other sites More sharing options...
ganchan Posted May 2, 2006 Report Share Posted May 2, 2006 there is a similiar way to know if there is any SID 6581 R4 or R3 inside?thankyou. Quote Link to comment Share on other sites More sharing options...
thefRont Posted May 2, 2006 Report Share Posted May 2, 2006 afaik the only way besides checking the keys is to open up the unit and check the chip itself.but so far checking the keys hasn't failed me. so it looks like a rather save way to determine which sound chip is inside. Quote Link to comment Share on other sites More sharing options...
ganchan Posted May 13, 2006 Report Share Posted May 13, 2006 ;Dso do you know if inside a c64c with normal f1 f2 position there is always a 6581r3 or r4 inside, or i can find all three relese before 8580r5 with no chance to identify without open?thankyou! Quote Link to comment Share on other sites More sharing options...
thefRont Posted May 15, 2006 Report Share Posted May 15, 2006 you will find a 6581 for sure but I can't tell you what revision the chips will have. but I think it's r4. Quote Link to comment Share on other sites More sharing options...
ganchan Posted May 15, 2006 Report Share Posted May 15, 2006 tnx, i'll try ;D Quote Link to comment Share on other sites More sharing options...
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