FIG. 1 is a front elevational view of an arithmetic and control unit showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front, top, left perspective view thereof;

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

FIG. 9 is a rear, top, left perspective view thereof;

FIG. 10 is a front elevational view thereof in the open position;

FIG. 11 is a rear elevational view thereof;

FIG. 12 is a left side elevational view thereof;

FIG. 13 is a right side elevational view thereof;

FIG. 14 is a top plan view thereof;

FIG. 15 is a bottom plan view thereof;

FIG. 16 is a front, top, left perspective view thereof;

FIG. 17 is a front, bottom, right perspective view thereof; and,

FIG. 18 is a rear, top, left perspective view thereof.