Re: Synertek 6502 compatibility

From: miika.seppanen_at_sci.fi
Date: Wed, 11 Apr 2012 12:44:12 +0300 (EEST)
Message-ID: <4707132.3701001334137453228.JavaMail.miika.seppanen@sci.fi>
Hello,

My VC-1541 (an early one with cream case) has a SY6502, and judging from the production dates, I presume it's an original installation. I bought the drive from original owner, and he never mentioned anything about repairs. Never had any problems with any software. I don't know, if any software uses undefined op-codes on 1541.

-Miika


didier derny [didier@aida.org] kirjoitti: 
> HI,
> 
> the synertek components are known to be bugged.
> that's why we only used mos technology or rockwell.
> 
> the 6522 and the 6551 where badly bugged
> but I never heard of this specific bug....
> 
> I dont know if these bugs were ever fixed.
> 
> --
> didier
> 
> Le 11/04/2012 00:42, Rob Clarke a écrit :
> > Hello gentlemen,
> >
> > Does anyone know if the Synertek 6502 is 100% compatible with its MOS 
> > cousin? I have one which I tried in an otherwise working PET and I get 
> > "31653.4784 BYTES FREE" instead of 31743, which is 89.5216 bytes short 
> > :-/
> >
> > I know some of the later CMOS incarnations did not have the same 
> > behaviour with undefined op-codes but a) this a 1984 chip and b) I 
> > can't believe the PET kernal would use them anyway.
> >
> > It is also possible that this chip is just duff of course.
> >
> > Rob
> >
> >
> >       Message was sent through the cbm-hackers mailing list
> 
> 
>        Message was sent through the cbm-hackers mailing list
> 


       Message was sent through the cbm-hackers mailing list
Received on 2012-04-11 10:00:06

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