yell0w_lantern Posted May 7, 2018 Share Posted May 7, 2018 I am working on a melted key CoCo 2. I changed the stock ram chips to 4164 chips fresh from Jameco. I jumpered the solder pads on either side of the w1 silkscreen. ?mem only shows 8k. I tried a second set of 4164s with the same result. Should I bother with a 3rd set of ram chips or might this be some other component causing the issue? Quote Link to comment Share on other sites More sharing options...
MarkO Posted May 9, 2018 Share Posted May 9, 2018 I am working on a melted key CoCo 2. I changed the stock ram chips to 4164 chips fresh from Jameco. I jumpered the solder pads on either side of the w1 silkscreen. ?mem only shows 8k. I tried a second set of 4164s with the same result. Should I bother with a 3rd set of ram chips or might this be some other component causing the issue? That is Strange... I did the same update, in the same manner on a friends Melted Key CoCo 2 and it worked fine... I would check all the Sockets and Pins looking for a Poor Connection.. If the Upper Address Lines were In-Op, the computer could not access the Upper RAM... MarkO Quote Link to comment Share on other sites More sharing options...
jdgabbard Posted May 31, 2018 Share Posted May 31, 2018 Yeah, sounds like poor connection on upper address lines. Maybe some cold joints? You might try reflowing with a soldering iron to see if that fixes the problem. Quote Link to comment Share on other sites More sharing options...
JamesD Posted June 1, 2018 Share Posted June 1, 2018 Sounds like it's not recognizing the jumper settings Quote Link to comment Share on other sites More sharing options...
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