all 80286 ps2 models ran at 10mhz. wait states differed. david In a message dated 98-03-21 13:42:20 EST, you write: << <Let me think... The 286 chip was available in 10MHz and 12MHz IIRC, mayb <another speed too. I can't remember which speed the 50/50Z was. The installed chips are 10mhz but that does not mean it ran that fast. <Don't you love the way the case comes apart, and that little tool <underneath the speaker to help take the rest of it apart? Defintley my They do come apart nice. But everything is oddball compared to the rest of my systems (s100, CPM and DEC based). Allison