This is a picture of a 1 meg MIO
The ICD MIO came in two types a 1 meg MIO and a 256k mio. These devices supported a R Handler, Print Handler and a SCSI port. The Ramdisk could be broken up into several different ram disks. Being it was self powered information would remain in the ram disk until powered off. This was a second generation device and the first pbi device to have a R port. There is a lot of support out there for the mio in ether SpartaDos or RealDos. Back in the late 1980's the MIO and Hard disk it could support allowed for at the time large BBS Systems. These devices worked by accident than purpose. But if you have one that works there is not a better PBI device.