Everything in a Nixdorf machine has an LFI plate stamped or stuck on it; basically a unique part number. This list will give the main LFI numbers for 8870/Quattro machines.
1528-01
DAP4 VDU CPU Processor 16K RAM
1528-03
DAP4 VDU CPU Processor 32K RAM
1528-05
DAP4 VDU CPU Processor 64K RAM (no old EPROM support)
1530-00
Hardware Arithmetic Unit
1537-01 (usually combined with a 1641-xx)
CPU Module (2 plates) and is usually attached to an internal memory module.
1559-xx (usually combined with a 1641-xx)
CPU Module (2 plates) and is usually attached to an internal memory module. Final variant of the 16-bit CPU
1641-00
Internal memory for CPU. 256Kb or 512Kb
1642-00
External memory. 512Kb
1642-01
External memory. 256Kb
1860-02
PLC2 (2 channel) Programmable Line Controller
1883-01 / 02
5 1/4″ Floppy Disk Controller
2549-00
MD/SMC Controller
3038-02
Battery Backup + CPU Reset switch
3109-02
Chassis PSU
3630-05
M25 Peripheral Tier (top level) backplane
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