This is a fork of https://github.com/dad4x/s4-3b1-pc7300 with fixes to work with my images of 3b1 disk drives.

Arnold Robbins has updated the sysv driver to work on more modern Linux systems, in particular on Ubuntu 18.04. He has added a README.md file in the sysv folder with more information.

Note that when creating files on a mounted System V filesystem, Linux will not truncate file names for you; you must keep filenames to 14 characters or less.

A fork of my fork is at https://github.com/arnoldrobbins/s4-3b1-pc7300/ that the sysv driver has been updated to work with Ubuntu 18.04.

Rest of this is the original readme.

Access to AT&T UNIX-PC 3B1 / PC-7300 / "Safari 4" tools, especially for disks, disk images, and filesystems.

• libs4, library for access to volume image files and file systems
• various command line tools using libs4
• Modified linux sysv filesystem that can mount file system images

Volume images can be used with the Phil Pemberton FREEBEE 3b1 emulator directly, or as disks on a real machine when using the Gesswein/PDP [MFM emulator board]www.pdp8online.com/mfm

Sub-alpha as of initial commit (1/2015). No guarantees, always work with copies! Images of volumes and file systems for the 3b1 are small enough by current standards that you should be expansive in your use of copies. A full-sized file volume image of 90M is not many seconds of cat video.

A header and library for opening files containing volumes, and poking around the filesystem that may be contained there. The header is <s4d.h>.

• s4date a date(1) that starts in 2000 instead of 1900, from SVR2 source
• s4disk tool to inspect volume images, similar to iv -t on the real machine
• s4dump a hex/ascii dumper tuned for dumping vol and FS files.
• s4export export filesystem from volume to mountable FS image file
• s4fs a tool for exploring FS image files (not very deeply)
• s4fsck SVR2 FSCK modified to work on possibly byte-swapped FS file
• s4import merge a FS file into a volume image.
• s4merge tool for merging multiple extracted volume images into one, block by block.
• s4mkfs SVR2 MKFS modified to generate a file and handle byte-swapping
• s4test whatever little test was needed most recently
• s4vol a tool for deeper futzing with volume files.

Modifications to linux to allow mounting of native file system images using

mount -t sysv -o loop filesystem-image-file /mnt/someplace

merging this to your local linux is out of my current comprehension, but I've gotten it to work with a Debian and a Suse.