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C64 II sid chip question [message #110845] Mon, 23 May 2005 16:14 Go to next message
nihilismus is currently offline  nihilismus
Messages: 5
Registered: May 2005
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Junior Member
I have two C64 II computers (the white ones) and am wondering how to
locate the sid chip on the motherboard. One machine has non-working
video and the other a blown sid, so I'm hoping to to a little sid
transplant to get one 100% working.

Thanks.
Re: C64 II sid chip question [message #110849 is a reply to message #110845] Mon, 23 May 2005 17:02 Go to previous messageGo to next message
BoroToro is currently offline  BoroToro
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Registered: December 2004
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Junior Member
nihilismus wrote:
> I have two C64 II computers (the white ones) and am wondering how to

> locate the sid chip on the motherboard. One machine has non-working

> video and the other a blown sid, so I'm hoping to to a little sid

> transplant to get one 100% working.


It has the following symbols written on top:

"8580"

It's a 28pin chip and always socketed. However - be careful.
Inexperienced people often break off or bend pins.
Re: C64 II sid chip question [message #110930 is a reply to message #110849] Tue, 24 May 2005 01:29 Go to previous messageGo to next message
nihilismus is currently offline  nihilismus
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Registered: May 2005
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Junior Member
On 23 May 2005 14:02:05 -0700, "BoroToro" <beiermann@gmail.com> wrote:

>

> nihilismus wrote:

>> I have two C64 II computers (the white ones) and am wondering how to

>> locate the sid chip on the motherboard. One machine has non-working

>> video and the other a blown sid, so I'm hoping to to a little sid

>> transplant to get one 100% working.

>

> It has the following symbols written on top:

>

> "8580"

>

> It's a 28pin chip and always socketed. However - be careful.

> Inexperienced people often break off or bend pins.


I already broke a pin on another C64 pulling out a chip. What is the
best way of removing a chip so that the pins don't break?
Re: C64 II sid chip question [message #110931 is a reply to message #110930] Tue, 24 May 2005 02:15 Go to previous messageGo to next message
Wing Fong Wong is currently offline  Wing Fong Wong
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Registered: December 2004
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Junior Member
nihilismus <REMOVETOREPLYphilowar@yahoo.com> wrote:
> I already broke a pin on another C64 pulling out a chip. What is the

> best way of removing a chip so that the pins don't break?

>

I personally like to use a medium flat bladed screwdriver (about 3mm) and
slowly lever each side of the chip. Move each side by about a 0.5 mm a
time and it should come out more or less evenly. You'll break many chips
initally but with practice it becomes quite easy.

--

Wing Wong.
Re: C64 II sid chip question [message #110933 is a reply to message #110930] Tue, 24 May 2005 03:08 Go to previous messageGo to next message
Jeremy Sieracki is currently offline  Jeremy Sieracki
Messages: 56
Registered: September 2003
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Member
> I already broke a pin on another C64 pulling out a chip. What is the

> best way of removing a chip so that the pins don't break?


I have two small screwdrivers, both flat, I insert them both slightly on either side of the chip
then rotate both simultaneously slowly so both sides are lifted together, usually have no problems
that way,

Jeremy
jeremysieracki@charter.net
Re: C64 II sid chip question [message #110940 is a reply to message #110930] Tue, 24 May 2005 15:28 Go to previous messageGo to next message
Sam Gillett is currently offline  Sam Gillett
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Registered: June 2003
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Senior Member
"nihilismus" wrote ...

> I already broke a pin on another C64 pulling out a chip. What is the

> best way of removing a chip so that the pins don't break?


To add to the replies you already have... If you have access to a chip
puller, use it. I may have a little difficulty describing a chip puller. It
is sort of like a pair of tweezers with a little prong pointing inward on the
bottom of each leg.

Insert each prong under an end of the chip, and while pulling upwards,
_gently_ rock the chip out of its socket.

Much more about removing chips can be found in the repair articles that Ray
Carlsen has on his website.
--
Best regards,

Sam Gillett

Change is inevitable,
except from vending machines!
Re: C64 II sid chip question [message #110985 is a reply to message #110931] Tue, 24 May 2005 15:40 Go to previous messageGo to next message
Axell is currently offline  Axell
Messages: 53
Registered: July 2003
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Member
Wing Fong Wong wrote:

> nihilismus <REMOVETOREPLYphilowar@yahoo.com> wrote:

>

>

>> I already broke a pin on another C64 pulling out a chip. What is the

>> best way of removing a chip so that the pins don't break?

>>

>>

>>

> I personally like to use a medium flat bladed screwdriver (about 3mm) and

> slowly lever each side of the chip. Move each side by about a 0.5 mm a

> time and it should come out more or less evenly. You'll break many chips

> initally but with practice it becomes quite easy.

>

>

>

To follow up, I use a watch screwdriver, 1.5mm. I find the best way is
to be extremely careful near the release. I usually put a finger on the
chip to prevent the sudden release of the chip from the socket.

"Look mom, no bent pins!"
Re: C64 II sid chip question [message #110988 is a reply to message #110940] Tue, 24 May 2005 17:57 Go to previous messageGo to next message
Sam Gillett is currently offline  Sam Gillett
Messages: 2422
Registered: June 2003
Karma: 0
Senior Member
"Sam Gillett" wrote ...
>

> Much more about removing chips can be found in the repair articles that Ray

> Carlsen has on his website.


Whoops!! Forgot to paste in the address for Ray's website.

http://personalpages.tds.net/~rcarlsen/

--
Best regards,

Sam Gillett

Change is inevitable,
except from vending machines!
Re: C64 II sid chip question [message #262790 is a reply to message #110845] Tue, 29 July 2014 19:37 Go to previous messageGo to next message
Anonymous
Karma:
Originally posted by: Alex_Barringer

Are you sure your SID is blown? Most of the time if you have distorted sound, it's a 1.8k ohm 5% 1/4 Watt resistor that goes bad over the years or because the load was too great across the audio port on the back.

The SID chip in the Commodore 64, is listed as the MOS or Commodore 6581 or 65C81. The C part of the number is the CMOS version and the standard version is TTL. Honestly, if you're looking for good sound the plain one is the way to go, it's also tougher too when it comes to overloading.

Where it's located in the on the PCB, depends greatly on the revision of the motherboard, it's usually found near the twin 6526 CIAs (those are the chips responsible for serial communications, disk access, modem, etc.)

Here is a Bing search, so you know what you're looking for, it has most of the variants listed with pictures.

http://www.bing.com/images/search?q=picture+of+6581+SID+chip &id=9A2E427071381BE1BE6DBB0039A8C12AE8B2D5DF&FORM=IQ FRBA

Hope this helps.
Re: C64 II sid chip question [message #262791 is a reply to message #110845] Tue, 29 July 2014 21:25 Go to previous message
rusure is currently offline  rusure
Messages: 1030
Registered: March 2012
Karma: 0
Senior Member
On Monday, May 23, 2005 2:14:46 PM UTC-6, nihilismus wrote:
> I have two C64 II computers (the white ones) and am wondering how to
> locate the sid chip on the motherboard. One machine has non-working
> video and the other a blown sid, so I'm hoping to to a little sid
> transplant to get one 100% working.
>
> Thpanks.

Before you try exchanging chips, try pushing the chips down into their sockets. This operation once completely restored the sound of one of my C128Ds to functionality. It's a simple operation and unlikely to damage your C= any further. It requires almost no manual dexterity.
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