[SCC_Active_Members] Test summary of Xerox and SRI keysets in the CHM collection

[Philip Gust]

Ed,

Thanks for posting this!  It seems like the right explanation for 
what we're seeing.  We'll make a note of that in our report and documentation.


At 11:20 AM 5/19/2006, Ed Taft wrote:
>On 5/19/2006 10:45 AM, Philip Gust wrote:
>>The only problem encountered was that our custom adapter cable was 
>>wired backwards, so key0 registered as key4, an so forth.  The 
>>cable was built from Xerox Alto schematics, and we need to 
>>determine whether the problem was how the cable was wired or the 
>>schematics.  In any case we were still able to complete the tests, 
>>and we can easily rewire the cable to set things right.
>Here is a possible explanation for this discrepancy --
>
>The Alto, like most machines designed at Xerox PARC, was a 
>big-endian machine. It was PARC custom to number bits on such a 
>machine left-to-right, so that the high-order bit is numbered 0. 
>This is in contrast to today's almost universal industry practice of 
>numbering bits right-to-left, so that the low-order bit is numbered 
>0. This might have caused confusion in interpreting the Alto schematics.
>
>Ed Taft


Philip Gust
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