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Need information and help...TI -> 32kb-> tipi -> RasPI connections


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Hi, I am a new TI99/4A owner.  This is my TI99/4a


Last weekend I could get a 32kb and a tipi on a retro meeting. 

I need to know the polarity of the 5 V jacket. So far someone told me the inner is plus (+) outer ir minus (-).   Can anyone confirm me this plaese?

How to connect the RasPI to the board. 

Please can someone post some hi-resolution photos? which pin goes where...


Thank you Jan 


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