Photos and ROMs are on the FTP now.https://www.8870adventures.com/
has some documentation.
Nixdorf's 8870s were a line of office/small business computers with various degrees of multiuser capabilities. They were running applications
in a business BASIC dialect.
The Quattro/7 is the result of mid 80's miniaturization efforts, just before PCs took over.
This particular machines consists of the following boards:
PSU Einschub (03141 02)
CPU/twin ALME port board (1543 03) mit 1MB VLSI Memory
Winchester and floppy disk controller (2538 03)
4 channel ALME board (1882 01)
20MB Harddisk (06259 00)
DAP4 Display-Arbeitsplatz mit Tastatur (Z80 based terminal, main 25xx ROM to be dumped later)
The archive contains ROMs from the CPU and floppy boards and what looks like a character ROM from the DAP4 terminal.
Toshi is going to try to read out the hardddisk with the MFM emulator board.
The CPU is said to be of Data General (nova???) descent.