Path: utzoo!attcan!uunet!cbmvax!fred
From: fred@cbmvax.UUCP (Fred Bowen)
Newsgroups: comp.sys.cbm
Subject: Re: Need Specs for 6582
Message-ID: <6882@cbmvax.UUCP>
Date: 16 May 89 12:38:06 GMT
References: <7517@spool.cs.wisc.edu>
Reply-To: fred@cbmvax.UUCP (Fred Bowen)
Organization: Commodore Technology, West Chester, PA
Lines: 26

In article <7517@spool.cs.wisc.edu> mark@shorty.WISC.EDU (Mark Spankus) writes:
>	I have the need to replace a SID chip in a C128.  The original chip
>is a standard 6581 (12 volts). I have a 6582, but no specs, other than a 
>statement saying that it is a 9 volt chip.  Are these two chips identical
>except for the voltages?  If so, then it would be no problem to drop the
>voltage for the chip & output transistor down a bit. 

You would have to change more than the voltage on pin 28.  The filter caps
at pins 1-4 should be changed as follows (referencing flat C128 only):

	C83	22000pf for 6582	 470pf for 6581
	C82	 2200pf for 6582	1800pf for 6581

and pin 27 audio out:

	R11	remove for 6582		1Kohm for 6581

I'd recommend you try and find the proper replacement part.
Normal disclaimer: hack at your own risk.
--
-- 
Fred Bowen			uucp:	{uunet|rutgers|pyramid}!cbmvax!fred
				arpa:	cbmvax!fred@uunet.uu.net
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Commodore Electronics, Ltd.,  1200 Wilson Drive,  West Chester,  PA,  19380