Most Data Discman models have a small low-resolution grayscale LCD (256x200 at first, then up to 320x240 and in colour for later models), a CD drive (either Mini CD or full size), and a computer that is not very powerful. Early versions of the device cannot play audio CDs. Software is pre-recorded and mostly is encyclopedias, foreign language dictionaries and novels. Software was usually made using the Sony Electronic Book Authoring System (SEBAS).