> Which version of the 4Kc manual are you looking at? I'm looking > at a very recent version of the 4Kc Software User's Manual > (version 1.17, dated September 25, 2002), and it only shows > Hit_Writeback_D to be invalid for *secondary and teritary* > caches, which makes sense, since the 4KSc doesn't have any. Note for the pendantic - that "S" was a typo, though of course the lack of secondary and tertiary caches applies to the whole 4K family, c, Ec, Sc, and Sd.