The Siemens PC 100 was a version of the 6502-based “AIM-65” SBC in a case and with slightly modified ROMs. Siemens offered a set of German-language manuals, which included translated Assembler (MOS Resident Assembler) and BASIC (Microsoft BASIC) manuals, but also a general manual (“Bedienungsanleitung”).
This is the 1981/1982 version of the “Bedienungsanleitung”, describing the hardware and its interfaces, as well as the monitor, editor and BASIC software:
Hans Otten’s Retro Computing site has a lot more documentation, as well as ROM images. (This version of the manual was missing though, and has since been added.)
Siemens Personal Computer PC 100 Bedienungsanleitung, Ausgabe 1981/1982
(232 pages, 39 MB)