in a hardware side, the calculators contain three different memory chips: a mask rom, a flash rom, and a ram. the mask rom is where the calculators store their operating system. it has a size of 4 megabytes from a chip r27t3202l manufactured by oki electric industry. since the mask rom is non-reprogrammable, the calculator operating system cannot be upgraded, unlike the newer casio calculators. the flash rom is a chip lp62s2048ax from amic technology. it has an actual size of 1 megabyte and is reprogrammable. the ram is a chip 29lv800cbti from macronix international. it has an actual size of 256 kilobytes. they are all placed on the same motherboard.