Oki Microline 520 Service Handbook page 25

%LSI
LSI
Location 04B: MSM79VO35
Detects the output of the two-phase sensor on the DC space motor to control the motor drive phase.
Transmits and receives serial data to and from the printhead based on the dot timing (which is derived
from the space motor speed).
Controls the external interface. The LSI is connected to the MPU.
ML520/521 ( 96-02-04 )