• Choose among the following memory organizations: IDT72T1845 ⎯ 2,048 x 18/4,096 x 9 IDT72T1855 ⎯ 4,096 x 18/8,192 x 9 IDT72T1865 ⎯ 8,192 x 18/16,384 x 9 IDT72T1875 ⎯ 16,384 x 18/32,768 x 9 IDT72T1885 ⎯ 32,768 x 18/65,536 x 9 IDT72T1895 ⎯ 65,536 x 18/131,072 x 9 IDT72T18105 ⎯ 131,072 x 18/262,144 x.