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.
DAP4 VDU CPU Processor 16K RAM
DAP4 VDU CPU Processor 32K RAM
DAP4 VDU CPU Processor 64K RAM (no old EPROM support)
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
Internal memory for CPU. 256Kb or 512Kb
External memory. 512Kb
External memory. 256Kb
PLC2 (2 channel) Programmable Line Controller
ALME – Asynchronous Line Multiplexer Extended
1883-01 / 02
5 1/4″ Floppy Disk Controller
Battery Backup + CPU Reset switch
M25 Peripheral Tier (top level) backplane
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