IBM Displaywriter
From Just Solve the File Format Problem
IBM 6580 DisplayWriter
A microcomputer for textprocessing which could also be used as terminal to "real" IBM computers.
8" floppy disks for storage, and the character set is some kind of extended EBCDIC or possibly EBCDIC with switchable code pages.
Bitsavers have many documents, but I found non describing the filesystem.
I had reason to reverse engineer a single such floppy, and got far enough to be able to compare the texts on another preservation copy, so all the hard stuff (tab-settings, etc. etc.) are still outstanding.
My code is now part of the "AutoArchaeologist" software tool
