How to reinstall OS 7.5 PM7200/120

Yes, of course. Begin by making a floppy with StuffIt Expander (you could use a Windows 98 PC for this):

With access to a Windows PC (capable of running a DOS program) with a floppy drive, you may want to try the following. Prepare an empty PC-formatted 1.44 MB diskette via FORMAT A: in DOS or the "full" formatting option under Windows. Download the MACDISK.EXE file from http://rrzs42.uni-regensburg.de/Macintosh/files/macftp.html . Run the MACDISK.EXE (DOS) program on the Windows PC. Follow the instructions on screen. The result will be a Mac-formatted (sic!) floppy that can be used on the Mac. This floppy contains a StuffIt Expander installer.

7.5.3 & 7.6 are light years apart in terms of stability of Open Transport. My 7200/75 was as unstable as a building in a third world country during an 8.0 earthquake until I updated to 7.6.

OK.

Now, move the floppy to the 7200/120. Drag-copy the StuffIt Expander installer from the floppy to the hard disk icon. Double-click on the installer and install the utility. If a special program icon is not shown, rebuild the Desktop: http://support.apple.com/kb/ht2344

Next, use your Windows 7 computer to download the following files (keep them unaltered).

From http://www.info.apple.com/support/oldersoftwarelist.html :

System_7.5_Version_7.5.3/System_7.5.3_01of19.smi.bin

System_7.5_Version_7.5.3/System_7.5.3_02of19.part.bin

System_7.5_Version_7.5.3/System_7.5.3_03of19.part.bin

etc to

System_7.5_Version_7.5.3/System_7.5.3_19of19.part.bin

(All the above 19 files can be found under the System Software Downloads link)

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/System/Mac_OS_8.1_Update/Disk_Tools_PPC.img.bin

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Utilities/Disk_Copy/Disk_Copy_6.3.3.smi.bin

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Display-Peripheral/CD-ROM/Apple_CD-ROM_5.4.img.bin

http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Display-Peripheral/CD-ROM/PowerCD_Setup_1.0.1.sea.bin

Burn these 23 files to an ISO 9660 CD-R at a low speed. Is it possible to read the CD-R (and to see all files) in the 7200/120?

Actually, I intentionally suggested downloading to and burning from a Windows computer. The reason is that a Mac OS X machine may try to decode the MacBinary (.bin). A Windows PC would not do that (at least not without special software). We want to keep the files as MacBinary (it does not matter if the file names have been truncated under Windows) until on the 7200/120.

The next step, when/if the 7200/120 can see the 23 individual files, would be to drag-copy the Disk_Copy_6.3.3.smi.bin and Disk_Tools_PPC.img.bin to the hard disk.

Then, decode these two .bin files by dragging them onto the StuffIt Expander program icon. The result should be one .smi file with Disk Copy and one .img file with Disk Tools PPC. Post back when this has been done.