Series 90 is a user interface for touch screen phones produced by Nokia. It is based on Series 80 and is currently history, as Nokia doesn't develop it any more.

There have been only two devices that use the Series 90 user interface, although only the other one, Nokia 7710, was launched to market. S90 devices' special characteristics include

• big, almost the entire front cover filling 640 x 320 pixels large display
• a touch screen, which is operated with a stylus

Although there are only two S90 devices, both of them have different user interface versions. Below is a list.

Series 90 1st Edition (S90 v1.0)

Series 90 2nd Edition (S90 v2.0)

In this window, which opens in a new window, there are images of both of the user interface versions.

Series 90 v1.0:

ROM drive Z:

Contains the operating system's and user interface's files. It's on a Flash memory chip in "read only" form, and it can only be edited during the firmware update.

User drive C:

This drive can be used as a storage area of the user's own files; the user can save his files and install applications here, and it won't empty although the device gets switched off.

User drive D:

This drive is a memory card, which can be attached into the device. Like the C: drive, it can be used as the user's own storage, and it won't lose its data although it wouldn't get any power.

Program memory - RAM

This is a memory for running programs. For example when the user opens an image file, the image and the image viewer applications gets loaded onto this memory. When the device is switched off, this memory gets empty. So basically this memory works like the PC's RAM memory.

Series 90 v2.0:

The memory structure doesn't differ from the S80 v1.0 in any way.

Like aforementioned, there are only two S90 devices published to date: Nokia 7710 and Nokia 7700. Below is a list of them.

- Although S90 platform isn't being developed anymore, the user interface lives on with the "Hildon" UI, which is used by Nokia's Maemo platform based devices (Nokia 770 Internet Tablet, Nokia N800 and N810).

- Some of Series 80 2nd Edition programs work on the Series 90 platform.