Gene Milligan Gene_Milligan at
Fri May 26 06:59:29 PDT 1995

Jim wrote:
>One way is to change arbitration to decouple the number of
>devices from the number of data lines.  This is straightforward,
>but is obviously a backward compatibility problem (all devices
>must know the new protocol (actually there may be some
>trick to support some legacy devices)).

 Before playing tricks, take a look at SCAM. In the PlugnPlay SCAM environment 
your allowed to have physical address conflicts. I have not looked but there 
might be a way to enhance SCAM to assign addresses in a manner that uses more 
addresses than bus lines. The scheme might be to assume a maximum of eight 
legacy (broader than SCAM legacy) devices and require that they be assigned 
addresses 0-7. Then the funny arbitration would be done with the bits 8-15 
allowing up to 256 non legacy devices plus the 8 legacy devices. Obviously we 
would run out of electrical compatibility long before we reached this protocol 

 I did not mean to imply that I was actually going to look into this embryonic 
idea. I merely let the bears chase me back into the cabin.


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