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   comp.sys.apple2      Discussion about Apple II micros      56,720 messages   

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   Message 55,613 of 56,720   
   Anthony Ortiz to All   
   Apple II TTL to 3.3 logic   
   18 Jul 22 22:29:50   
   
   From: anthonypaulo@gmail.com   
      
   I'm redesigning some circuitry I have on my peripheral board to a modern 3.3v   
   CPLD and read some articles on the interwebs stating that TTL logic is about   
   3.4 volts so I might get away with interfacing a 3.3 chip straight from the   
   Apple IIe bus and do    
   away with the 245 transceivers I'm using. My gut feeling is to have the 245's   
   there just in case and err on the safe side, but I'm curious as to what you   
   guys think about going raw from the Apple II bus to a 3.3v GPIO that's not   
   that tolerant.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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