Brittle chip pins

Tim Shoppa tshoppa at wmata.com
Tue Jan 24 12:38:27 CST 2006


At 08:43 AM 1/24/06 -0500, you wrote:
>Okay, I figured out the immediate problem. Three of the pins on one  
>of the EPROMs have broken off. One was hanging by a thread and fell  
>off when I inspected it. I see no evidence that the pins remain in  
>the sockets so I guess they must have fallen off when I removed the  
>EPROMs to read them in my EPROM programmer. I suppose this suggests  
>that they may have fallen off *before* I read them and that is why  
>your SnapFORTH ROMs don't work. I don't think that's the case though  
>because I'm sure I would have noticed that. Do EPROM (or chip pins in  
>general) get more brittle as they get older? 

They were plenty brittle to begin with!  See for example the graph labeled
"Number of pins remaining vs number of socket insertions" in the WOM data sheet:

http://academics.vmi.edu/ee_js/Research/IC_Datasheets/digital_cmos/Write%20Only%20Memory.pdf

Tim.




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