shoestring Posted April 4, 2018 Share Posted April 4, 2018 My 65XE doesn't have the wires and uses a 130XE motherboard. Quote Link to comment Share on other sites More sharing options...
Osgeld Posted April 4, 2018 Share Posted April 4, 2018 My 65XE doesn't have the wires and uses a 130XE motherboard. I have a pal 65XE using the 130XE mobo and it does, whatever it was patching was either fixed in newer rev's or found in older rev's and patched, mine is a 067 rev B Quote Link to comment Share on other sites More sharing options...
+tf_hh Posted April 5, 2018 Share Posted April 5, 2018 My 65XE doesn't have the wires and uses a 130XE motherboard. This newer revision of the XE series mainboard has the fix already onboard (routed on the PCB). Quote Link to comment Share on other sites More sharing options...
shoestring Posted April 5, 2018 Share Posted April 5, 2018 (edited) This newer revision of the XE series mainboard has the fix already onboard (routed on the PCB). Indeed, the board pictured above is the same one you helped me fix Edited April 5, 2018 by shoestring Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted April 8, 2018 Share Posted April 8, 2018 What are the wires actually connected to, all of the pictures are taken from the wrong side of the mobo to show clearly. Quote Link to comment Share on other sites More sharing options...
1050 Posted April 11, 2018 Share Posted April 11, 2018 They utilize an unused gate on the LS08 AND gate to provide a delayed or boosted chip select signal to GTIA. Some with, some without and I doubt any board is using the unused gate of the LS08 from the factory. I still contend this is just busy work. Not ever needed in the first place and no harm or foul if done or left undone. Why? PCB repair crew left not busy would be having food fights and reading novels on company time. So you pile perfectly good machines to the ceiling next to them and tell them to get busy doing this 'mod'. When one shows up off the line that is actually broke and needs repair it gets pushed to the next one done, otherwise you know what you will doing all day long. Similar useless wiring 'mods' are done to the XL line too. On the underside of 'wired' boards there is a cut trace from the MMU pin 15 to GTIA pin 32, So if you want to pull the wires, you'll have to restore that trace on the bottom. Or as one guy put it, you have no video. Quote Link to comment Share on other sites More sharing options...
1050 Posted April 11, 2018 Share Posted April 11, 2018 No edit for some reason. Wrong chip above, pin 15 of U2 LS138 which is doing part of the MMU decoding is where GTIA chip select signal comes from. And they do put this fix in on modern boards to my surprise. Might be a little more to this story than post #31 would point to. Quote Link to comment Share on other sites More sharing options...
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