From: charlieDOTd@verEYEzon.net   
      
   On 10/3/2021 1:26 AM, Lukazi wrote:   
   > Cards which contain memory (ROM) are easy to be made auto detectable because   
   the memory can be programmed to output a specific identifier to the peripheral   
   slot memory locations ie $C0XX. However it is much more difficult to detect   
   cards that do not    
   contain any memory chips.   
   >   
   > The 4Play card is detectable because of luck. The unique pattern it   
   generates by default produces $20, $20, $20, $20 for locations $C0X0 to $C0X3.   
   So this is also easily read by the A2 to determine the slot.   
   >   
   > However cards such as the SNES MAX do not produce any output until they are   
   asked to do so ie poking addresses to determine what you get back. Therefore   
   my questions are:-   
   > Is is ok to poke each peripheral slot in an attempt to determine a cards   
   identity?   
   > Does this have the potential to screw up the setup on other slotted cards   
   (I'm thinking about I/O cards because poking will be driving physical external   
   devices)?   
      
   Yes, I would not do that.   
   I can't speak for other cards but I have used the $C0xx locations for   
   I/O on Carte Blanche projects.  Some of the locations are used to send   
   commands to the card.  Randomly poking these locations could   
   theoretically cause something unwanted to happen.   
   In my projects, I like to put the value $CB in $C0xF to make it easy to   
   locate the card.   
      
   Charlie   
      
   > Was there a best practise guide between developers for doing this?   
   > Is there consolidated information anywhere on how A2 auto slot detection of   
   cards was performed?   
   >   
   > Thank-you for your help.   
   >   
   > Cheers,   
   > Alex.   
   >   
      
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