From: Jürgen Sievers (juergen.sievers_at_NADINE-Software.com)
Date: 2003-02-05 03:13:42
> -----Original Message----- > From: email@example.com > [mailto:firstname.lastname@example.org]On Behalf Of Nicolas Welte; > address is valid for replies (Re:) only! > Sent: Wednesday, February 05, 2003 12:39 AM > To: email@example.com > Subject: Re: 6540 ROMs replacement ? > > > Jürgen Sievers wrote: > > The sockets installed are very sheap and so the new sockets > could not fit > > into the old sockets. > > The renewed only touches the side of the top parts from the old > sockets. But > > without much pressure and so some pins don't getting into > contact. I can't > > press the new sockets into the old sockets deep enough. > > Then you should replace the old sockets. Precision sockets give the best > contact and will last for decades, but some people (including me) have the > opinion that they look ugly in an old PET. Low cost sockets with a double > contact spring are what looks most like the old sockets, and they > also give > very good contact. > Yes, that's was the solution. After I have removed the fixture from the old sockets I saw the dilemma. Some of the springes was broken. By the way. A good way to remove the old sockets is to cut up the fixture by using a small drill tool with a cutter wheel on it. Then you can remove each pin with a soldering iron and a pliers. But one of the 6540 may be really damage. But what's the cause, why your adaptor doesn't work on the systems ROM but on the character generator? When I look on the circuit diagram diagram I can see 2316B instead of 6540A. Maybe I have a wrong plan. > BTW, I have no problems if I put my adaptors with gold contacts > into the old > sockets. It seems the contact problem is also caused by corrosion > on the old > chips and on the socket contacts. Do you have a prefabricated constructed one for me ? j. > > Nicolas > > > > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list
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