Hi, I'm pretty certain I've seen more than one Einstein with the "A:" drive replaced by a 3.5" unit (and definitely one with two 3.5" drives). In fact, if I recall correctly, we had an Einstein in which the "A:" drive had been replaced with a 3.5" unit (for compatability with Spectrum disc units) at the software company I was working at in 1986; our "fearless leader" (and yes that was meant to be sarcastic) used his Einstein to cross-assemble code for the Spectrum. TTFN - Pete.