486SL vs 486DX SL-enhanced

[Sean Chou <sean@mba.cba.uiuc.edu>]

> >The ThinkPad 755C with an SL enhanced DX2/50 is suppose to be upgradable
> 
> Wait a minute!  SL enhanced???  Is this the same kind of processor in the
> 750c?  If so, then why isn't the 750c upgradable to the DX4?  I called this

The SL enhanced is not the same as the chip in the TP750 series.
The TP750 has a 486SL, not a 486DX with SL-enhancement.