Dave's computers

The turntop is a portable computer, created by alchemizing the Timetables and Dave's PC. It costs 600 Build Grist, 1200 Garnet, 900 Mercury, 300 Gold, and 1 Diamond. It allows him to take his PC with him wherever he goes - a significant upgrade over the iShades, as it allows him to operate Sburb. In addition, it possibly has some kind of time powers (for instance, being to talk to the other kids at different points in time), but these have not been demonstrated thus far.

After the scratch, Dirk Strider's primary, home desktop computer seems to be a turntop.