Model 100 Manuals
- http://ftp.whtech.com/club100/doc/TRS80-M100-User-Guide.pdf
- http://ftp.whtech.com/club100/doc/m100qr.pdf
- http://ftp.whtech.com/club100/doc/m100ServiceManual.pdf
- https://archive.org/details/TandyM100ServiceManual (mostly higher quality scan, but the schematics are still blurry)
- http://ftp.whtech.com/club100/doc/m100TechReference.pdf
- http://ftp.whtech.com/club100/doc/rom_funcs-600.pdf
Other even more valuable info:
- John R. Hogerhuis: "The best reference on file management is the NEC programmers reference."