The hardware is based on Sega Mega Drive, with some parts removed and replaced by others:[2]
CPU: 16/32-bit Motorola 68000, the same as in Mega Drive
RAM: 64 KB of Main RAM
Video RAM: 64 KB
ROM: "Storyware" cartridges of various sizes
Video: 315-5313 VDP, same as in Mega Drive
Sound: Texas Instruments SN76489 PSG and custom PCM chip
Input: pen and buttons