From: anthonypaulo@gmail.com   
      
   On Tuesday, July 19, 2022 at 10:05:57 PM UTC-4, Michael J. Mahon wrote:   
   > > 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.    
   > >   
   > Nope—you’ll need level-changing circuitry and keep the 245’s. The   
   Apple II    
   > bus is *definitly* a TTL bus.    
   >    
   > --    
   > -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com   
      
   Thanks Michael, you're always a great help and an invaluable source of all   
   things Apple II. :)   
      
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