I cannot think of *any* MicroVAX or VAXstation that has two SCSI connectors of *different* sizes. The VAXstation 3100s pretty much all have a single SCSI connector (the small size - HD68 is what I've seen it called in the past). The VAXstation 4000-9x/60 have one Amphenol 50-way SCSI connector (the expansion boxes have two, but connected as an in-out bus). I forget about the 4000-VLC, but it cannot really have room for more than one connector! The MicroVAX 3100 series machines are all (IIRC) in one of two similar boxes - the only difference being the height (the larger one has two trays on to which hard drives may be mounted - the smaller one has only one tray). Looking at the back, there should be three connectors across the top (I think these connectors are always there, even if they are not used internally). The right-most connector (looking from the back, I think) should be the SCSI port; it is a 50-way amphenol connector. This is the same as the conectors on a TK50Z. Antonio arcarlini(a)iee.org