3.25'' DISK-DRIVE

Yes, it's really a 3.25" disk drive with 3.25" diskettes, a new format created by Dysan to replace the 5.25" format. Sadly, this format never became a standard and was quickly forgotten.

About this prototype, Doug Rosenvinge says:

My drive is a working prototype and not a production unit. The drive case replaces the memory console cover. The drive connects to the Adamnet port and uses a 3 pin power supply of the type used for some of Coleco's accessories. I have also seen a version of the drive that fits in the memory console itself in the larger bay in place of a tape drive. That version uses the same plugs as the tape drive for its signal and power.

The reason this drive is so large is that it's logic board is wire-wrapped and is next to the drive in the case.

Of interest is the way the disk is inserted. It slides in onto a built in tray that can be pushed in and locked in place by pushing down lightly on the tray. The total movement is about 1/2". To take the disk out just push the tray in and up and out pops the disk. Rather neat.

Off hand I can't remember the full storage capacity, but it was compatible with the tape drive although I think you could reset the capacity in the directory and get a couple more blocks of storage. Of course if you did store more than it would not be 100% the same as a tape.