I've been searching high and low for the "SuperSPARC User's Guide". At one time it was published as Sun part number 801-4272-01 and TI part number 2647726-9761. A previous TI version was apparently published as SPKU005 (and possibly 2647726-9721, although that could be a typo).
Sun and TI don't seem to have it any more. Has anyone here been able to track down a copy? Ironically, this message will probably simply add to the few extant references to this document on the Internet, all of which are searching in vain. (I found the SuperSPARC II Addendum, but it just documents the differences between the SuperSPARC I and II. It doesn't provide a full description of the processor.)