If Scheme is so good why MIT drops it?

[Bob Martin]

in 121683 20090719 210126 Terry Reedy <tjreedy at udel.edu> wrote:
>Roy Smith wrote:
>> In article <1cethsrrw8h6k$.9ty7j7u7zovn.dlg at 40tude.net>,
>>  Frank Buss <fb at frank-buss.de> wrote:
>>
>>> there is one free unique implementation on the 3 major platforms Linux,
>>> Windows and MacOS X
>>
>> Most people would still consider Solaris to be a "major platform".
>
>?? I do not, but I have no idea what comes in 4th after the other three
>by whatever metric.

I think the OP means "major PC operating systems".  Those with a wider 
knowledge of the computer world would consider IBM's mainframe operating
systems to be deserving of the description "major".