Nice CoCo2! I agree with the commenter stating you might be having some RAM issues. The chips in question are the ones labeled U14 and higher, just under the top edge of the keyboard. They’re definitely the most failure-prone parts as the rest of the CoCo is fairly robust. My CoCo2 and 3s all still work beautifully after all these years! :)
Ha, funny how the C64 the Speccy and the CoCo's all share similar issues. What kind of memory does the CoCO2 take? I'll need to order some from Ali Express. I assume that the piggyback technique can be used to bypass a soldered on chips (to see which is bad before taking it off). I hope that's what it is...I have a 16K Spectrum that seemed to be memory issues but I could not track it down because replacing (and socketing) all the RAM made no difference.
@@8BitRetroJournal I believe the 64k version takes 4164 chips, but I could be mistaken. I haven’t opened my CoCo2 yet. I would just get ones that match yours! :) I have never tried the piggyback method; I’ve always just replaced chips. The CoCo3 makes this pretty simple as the RAM is socketed.
I wasn't sure what I'd find. I guess I thought it would be a bit more clear where each component was...or perhaps a separate circuit board for the power supply like some machines have.
You can remove the transformer and put a USB-C socket where the factory cord comes out... Just the slightest bit of filing to extend the oval cutout. I hate permanent power cords 😁 Also highly recommend a power LED.
Looks likea RAM issues. Thanks for sharing
Nice CoCo2! I agree with the commenter stating you might be having some RAM issues. The chips in question are the ones labeled U14 and higher, just under the top edge of the keyboard. They’re definitely the most failure-prone parts as the rest of the CoCo is fairly robust. My CoCo2 and 3s all still work beautifully after all these years! :)
Ha, funny how the C64 the Speccy and the CoCo's all share similar issues. What kind of memory does the CoCO2 take? I'll need to order some from Ali Express. I assume that the piggyback technique can be used to bypass a soldered on chips (to see which is bad before taking it off). I hope that's what it is...I have a 16K Spectrum that seemed to be memory issues but I could not track it down because replacing (and socketing) all the RAM made no difference.
@@8BitRetroJournal I believe the 64k version takes 4164 chips, but I could be mistaken. I haven’t opened my CoCo2 yet. I would just get ones that match yours! :) I have never tried the piggyback method; I’ve always just replaced chips. The CoCo3 makes this pretty simple as the RAM is socketed.
So, you were expecting to find a switch mode power supply, but found a linear powet supply.
I wasn't sure what I'd find. I guess I thought it would be a bit more clear where each component was...or perhaps a separate circuit board for the power supply like some machines have.
You can remove the transformer and put a USB-C socket where the factory cord comes out... Just the slightest bit of filing to extend the oval cutout.
I hate permanent power cords 😁
Also highly recommend a power LED.
@@CoCoNutBob so the CoCo only needs 5 volts?
@@8BitRetroJournal for the most part... Cassette and serial I/O require higher levels, but can be run with just 5v
All the heat sink are bent like that.
Was that done to squeeze it past something?
Maybe to do with the keyboard on all early CoCo 2's @@8BitRetroJournal