[rescue] Any info on an MDI 240 SDI drive unit?

Josh Dersch derschjo at gmail.com
Sun Apr 24 22:14:02 CDT 2016

Hi all --

I just picked up an interesting device, it appears to be a drive 
emulator of sorts that adapts DEC SDI to either ESDI or MFM drives (I 
would guess ESDI since this thing is from the late 80s, but no real way 
to be sure.)  It's manufactured by "Micro Technology" and is labeled as 
an "MDI 240" on the front.  (On the rear as "SPEC.MDI-240", P/N 

Mine has no drives in it, just a power supply and two logic boards 
labeled "MSD13B" that connect to the drives.  I can't find much 
information about this unit at all, and just a bit about Micro 
Technology (apparently they were sued by DEC for building this device :)).

I'd like to be able to use this thing (possibly with my VAX 11/750).  
Anyone have any information hiding somewhere about it?


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