mkdisk(1) on Linux
The text d8104c127f25, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
Make a blank emulated floppy or hard disk for xtrs, or add/remove an emulated write protect tab