The Evotek 5000 series is a bog-standard ST-506/ST-412 "MFM" interface.
OEM manual is on Manx:
http://manx.classiccmp.org/mirror/harte/Evotek/ET-5000%20Family%20OEM%20Man…
Back in 1983 I had an opportunity to play with one. Pretty interesting,
but very expensive, as I recall--and not terribly reliable.
I've skimmed that manual and wonder why they are 'pretty interesting'. What
have I missed?
-tony