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What are these wires for? (130 XE)

mod fix 130xe hack wires

31 replies to this topic

#26 shoestring OFFLINE  

shoestring

    Dragonstomper

  • 545 posts
  • Location:Sydney

Posted Wed Apr 4, 2018 4:51 PM

My 65XE doesn't have the wires and uses a 130XE motherboard.

 

0d0bba061e81754ae8b51d4fc173f347.jpg



#27 Osgeld OFFLINE  

Osgeld

    Quadrunner

  • 5,870 posts
  • Location:Nashville, TN

Posted Wed Apr 4, 2018 5:01 PM

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



#28 tf_hh OFFLINE  

tf_hh

    Dragonstomper

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  • Location:Germany

Posted Thu Apr 5, 2018 5:22 AM

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).



#29 shoestring OFFLINE  

shoestring

    Dragonstomper

  • 545 posts
  • Location:Sydney

Posted Thu Apr 5, 2018 6:32 AM

 

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 icon_thumbsup.gif


Edited by shoestring, Thu Apr 5, 2018 6:32 AM.


#30 hueyjones70 OFFLINE  

hueyjones70

    Chopper Commander

  • 240 posts
  • Location:Clayton, North Carolina

Posted Sun Apr 8, 2018 12:07 PM

What are the wires actually connected to, all of the pictures are taken from the wrong side of the mobo to show clearly.

#31 1050 OFFLINE  

1050

    Stargunner

  • 1,065 posts

Posted Tue Apr 10, 2018 7:33 PM

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.

#32 1050 OFFLINE  

1050

    Stargunner

  • 1,065 posts

Posted Wed Apr 11, 2018 12:21 AM

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.





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