USED PBM3960 Microstepping Controller/dual Digital-to-analog Converter, in 22 pin plastic DIP package.

Used in conjunction with the PBL3771 stepper motor driver IC. I have fourteen of these, all removed from a used Goldenscan HPE. Further information can be found here - https://www.alldatasheet.com/datasheet-pdf/pdf/60249/ERICSSON/PBM3960.html