DCT3 platform

The DCT3 platform or Digital Core Technology 3 is a hardware platform used on Nokia phones. It was introduced in 1998 with the Nokia 6110.

DCT3 was Nokia's first platform based on an ARM processor, the Texas Instruments MAD2, which has a 13 MHz ARM7TDMI core. DCT3 platform phones used Nokia's proprietary Series 20 user interface.

There is a modified version of the DCT3 platform used on the 92xx series of communicators called DCT-L. The L stands for Linda, the 9210's codename.

DCT3 was succeeded by the DCT4 platform in 2002, which added a basic form of encryption for firmwares.

Modding
DCT3 phones did not have much protection, and they were relatively popular targets for custom firmware. NokiX is an open source tool for modifying DCT3 firmwares with scripts to add new features, such as applications, games, and UI improvements.

There is an experimental MAME driver for DCT3 phones.

Hardware details of various DCT3 models can be found on the archived Project Blacksphere.