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IIc Keyboard Woes


3 replies to this topic

#1 dj_sudo OFFLINE  

dj_sudo

    Space Invader

  • 19 posts

Posted Sat Sep 16, 2017 9:13 PM

I got a very dirty IIc locally. The initial memory test showed a bad RAM chip, which I've replaced. The self-test now reports "System OK," which is great! The only problem is that after replacing the chip, the keyboard (which worked before) now does nothing. No keys register, and the cursor sometimes either blinks VERY fast or shows an "alternate" character, a cross in reverse color, which isn't even supposed to be in the IIc's character set. Any thoughts? I've piggy-backed a keyboard encoder chip with no change. Maybe a bad character generator rom?



#2 Osgeld ONLINE  

Osgeld

    River Patroller

  • 4,447 posts
  • Location:Nashville, TN

Posted Sat Sep 16, 2017 9:22 PM

if it worked before its probably a bad connection after you put it back together 



#3 spacecadet OFFLINE  

spacecadet

    River Patroller

  • 2,389 posts

Posted Sat Sep 16, 2017 9:29 PM

Clean and reseat the ribbon cable. Check all pins and the cable itself for damage.



#4 Keatah OFFLINE  

Keatah

    Quadrunner

  • 18,935 posts

Posted Sun Sep 17, 2017 1:49 AM

Check for solder shorts in the area. Check the Keyboard ribbon-cable connector. Rock and reseat socketed chips. Is the replacement RAM chip the same speed and type?





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