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SuperCart Construction

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Actually, looking at the SuperCart construction notes, there's already a resistor between pins 27 and 28. If you've built the SuperCart using a TI game cartridge as per http://www.mainbyte.com/ti99/supercart/supercart_4bank.html, then you should be able to write protect the RAM simply by inserting a switch in the wire between the 3rd edge connector pin and pin 27 of the RAM. 

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