In 1991, Apple released a hand-held diagnostic tool for Macintosh computers and SCSI hard drives called the TechStep. It was sold exclusively to Apple resellers and service centers for $1,000. The primary SIT software archive contains Disk Copy version 6.3.3 & 4.2 disk images of the two included software floppy disks. This software runs on vintage Macintosh computers of the era (e.g., System 6 & System 7) and is required to extract logs from the TechStep. Software also allows a Macintosh to diagnose a TechStep. One floppy contains a HyperCard stack that gives a complete overview of the TechStep, including a software simulator.
The second SIT archive contains 18 Apple "Tech Info Library" PDF files extracted from Apple's Service Source Companion Vol.2 CD-ROM from 1997.
TechStep.sit (890.92 KiB / 912.3 KB)
TechStep Software Floppy Disk Images / compressed w/ Stuffit
TechStep---Tech-Info-Library.sit (53.63 KiB / 54.91 KB)
Apple TIL on the TechStep (18 PDFs) / compressed w/ Stuffit
Runs on most 68k Macs with a SCSI port including the Macintosh Plus, SE, SE/30, II, IIx, etc.
Emulating this? It should run fine under: Mini vMac