They're all full height 5 1/4" drives and
they weigh a ton.  The first one
 is marked "digital  RZ55" and has a sticker that says "1041080-08-9"
and it
 appears to have a SCSI interface.  
a 300-something meg SCSI drive
  The second one appears to have a ST-506
 interface and is a Maxtor drive and is marked "RD54-A" and
"30-26245-01"
 and "RQDX 3". 
a 150 meg MFM drive.
   I also picked up a couple of keyboards that I think
might be for a DEC.
 The first one is a large keyboard marked "TS 803".   
This is from a Televideo 803. It's a CP/M machine.
  The second keyboard is from digital and is a model LK
201. Doe
 anyone know which machine it's for? 
Just about anything from Rainbows, DECmates, and Pros up to the DEC 3000
series Alphas (newer Alphas use PC-style keyboards).
Roger Ivie
ivie(a)cc.usu.edu