AT&T 3B2 System V Release 3 Development Software

This directory contains optional software development tools for the 3B2.

There were several versions of tools released, and this archive does not have all disk images from all versions. However, all versions of Issue 4 software are compatible in such a way that if a tool is missing from one version, the corresponding tool from a different version may be substituted.

These images are straight sector-by-sector copies of original floppies. If you wish to write them to physical diskettes again, you can use the dd utility in UNIX or Linux, or the ImageDisk utility in DOS.

Physically, diskettes are two-side 80 track 96tpi DS/DD media using 250kbps MFM encoding, 9 sectors per track, 3:1 interleave.

[PARENTDIR]Parent Directory 
[DIR]Other_Languages/Other Programming Languages
[DIR]Issue_4_Version_2/Assembly and C Programming: Issue 4 Version 2
[DIR]Issue_4_Version_1/Assembly and C Programming: Issue 4 Version 1
[DIR]Issue_4_Version_0/Assembly and C Programming: Issue 4 Version 0

Maintained by Seth Morabito <>

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