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 and those for any other machines I’ve discovered.
1526-xx
8890 DAP4 VDU CPU Processor 16K RAM
8870 DAP4x or BA62 CPU board.
1530-00
Hardware Arithmetic Unit
![](https://8870adventures.com/wp-content/uploads/2023/01/1530-00-01-1024x110.jpg)
1537-01 (usually combined with a 1641-xx)
CPU Module (2 plates) and is usually attached to an internal memory module.
![](https://8870adventures.com/wp-content/uploads/2023/01/1537-01-01-1-1024x365.jpg)
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
![](https://8870adventures.com/wp-content/uploads/2023/01/1642-01-01-1-1024x121.jpg)
1860-02
PLC2 (2 channel) Programmable Line Controller
![](https://8870adventures.com/wp-content/uploads/2023/01/1860-02-01-1024x129.jpg)
1883-01 / 02
5 1/4″ Floppy Disk Controller
![](https://8870adventures.com/wp-content/uploads/2023/01/1883-01-01-1-1024x120.jpg)
2549-00
MD/SMC Controller
![](https://8870adventures.com/wp-content/uploads/2023/01/2549-00-01-1-1024x130.jpg)
3038-02
Battery Backup + CPU Reset switch
![](https://8870adventures.com/wp-content/uploads/2023/01/3038-02-01-1.jpg)
3109-02
Chassis PSU
![](https://8870adventures.com/wp-content/uploads/2023/01/3109-02-01-1-1024x362.jpg)
3630-05
M25 Peripheral Tier (top level) backplane
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