From: kjpmail@gmail.com   
      
   Thank you!  Based on your description below, both of these machines are ROM 3.   
      
   On Tuesday, April 27, 2021 at 10:58:15 AM UTC-4, Christopher C. wrote:   
   > The ROM 3 wasn't sold until the end of 1989, so could a 1989 ROM 01 have the   
   newer copyright on its sticker? Good question.    
   >    
   > But there are easier ways to determine if you have ROM 3s since the   
   computers are in your possession. GS motherboards are so easy to swap that   
   using the copyright or serial number on the case sticker should only be   
   resorted to if you can't see inside    
   the case (like for example, in an ebay auction).    
   >    
   > It should be easy to google photos of both boards, but quickly, if you see 8   
   identical size chips (in two rows of four) labeled FAST RAM, it's a ROM 3. If   
   there are is only one row of four, it's a ROM 01. The battery is soldered to   
   the motherboard with    
   two leads on a ROM 01, but has a plastic holder/compartment on a ROM 3. I   
   guess it's possible a ROM 3 has its plastic battery cage removed completely...   
   But there should be no mistaking the number of clearly labeled "Fast RAM"   
   chips on the motherboard.    
   The ROM 01 also has the battery under the power supply near the edge of the   
   board, while the 3 has it right next to slot 1 and the power connector.   
      
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