What model? And sorry, any MASSBUS drives I might have access to are in Sweden... A pair of KS10s, I divers for the KS to use RM02/RM03/RM05/RM80/RP04/RP05/RP06 I theory you can use any SMD disk with the RM adaptor as long as it don't run to fast (data separator clock speeed is limited to some 35Mbit) I also did a SCSI card that fits in one of the empty slots, but that was when I realized, you need more memory and more cpu...... -:) DECnet on the 2020 is limited to Tops10 and Panda version of 4..x and MTU is 320 bytes or so so you hae to be a end-node with the KMC/DUP. -P