FIG. 1 is a front right top perspective view of an arithmetic and control unit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a front right bottom perspective view thereof.

FIG. 9 is a reference right side elevational view thereof, wherein a lid portion is in the open position;

FIG. 10 is a reference bottom plan view thereof, wherein a lid portion is in the open position; and,

FIG. 11 is a reference front right bottom perspective view thereof, wherein a lid portion is in the open position.