I recently picked up a Duo Dock II, and desired to remove the lid and swap it with my other dock... I removed the lid from the DDII and noticed that it had a 68-pin SIMM in the holder near the (Tick Of Death) motor... I do not think any of the DD's I have ever owned had the SIMM installed.. pray tell, what does it do? Craig W. ---------- Hi Craig, Isn't that the FPU? More knowledgeable listers can confirm this and probably tell you which duos can benefit from it. David