AT&T 3B2 Maintenance Utilities

These are bootable diskettes containing the DGMON diagnostic monitor, as well as hard disk and floppy disk formatting utilities. One disk supports the 300/310/400 series of 3B2, while the other supports the SCSI 500/600/700/1000 series.

Diskette images are straight sector-by-sector copies of original floppy disks. 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 double-sided, 80 track, 96 tpi DS/DD media using 250kbps MFM enoding, 9 sectors per track, with 3:1 interleave.

File Type Size
Maintenance Utilities for the 3B2/500, /600, /700, and /1000 Disk Image 720.0 KB
Maintenance Utilities for the 3B2/300, /310, and /400 Disk Image 720.0 KB