TheSIMpad is a portablecomputer developed by the company Keith & Koep by order ofSiemens AG, with an 8.4" TFTtouchscreen. Commonly used with wireless network cards, it was marketed as a device to browse theWorld Wide Web. Initially announced in January 2001 at theConsumer Electronics Show.

There are five known model variants, all out of production:

• CL4: The low-end model with 32 MBRAM and 16 MBFlash ROM withoutPC card slot but withDECT modem.
• WP50: A variant sold bySwisscom. Same as the CL4.
• T-Sinus Pad: A variant sold byDeutsche Telekom. This one is the same as the CL4 but with a PC card slot.
• SL4: The high end model, with 64 MBRAM and 32 MBFlash ROM. This one also has a PC card slot.
• SLC: Identical to the SL4, but with the addition of a Siemens MD34DECT modem, allowing connection to certain SiemensISDN telephone systems.

All variants contain:

• AnIntelStrongARM#SA-1110 SA-1110 32-bitRISC processor with a clock frequency of 206 MHz
• An 8.4"TFT LCD with anSVGA resolution (800×600 pixels)
• 4-wire analog resistive touch interface
• A single 16-bitPC card slot (not included in some CL4 models designed to use the Siemens MD34 DECT module)
• A standardISO/IEC 7816SmartCard interface
• AUSB 1.1 client interface (not fully functional in production releases, but see Mullenger.org below)
• AnIrDA interface (V1.3, SIR)
• Aserial interface (proprietary Siemens "Lumberg" socket)
• A 7.2 V 2800 mA·hLithium Ion Battery (~4hr life)
• A built-in mono speaker
• A built-in microphone (not on CL4 models)
• A headphone interface (proprietary Siemens "Lumberg" socket)

All devices weigh approximately 2.2 lb (1 kg) and measure 10.35 × 7.08 × 1.10 inches (263 mm ×181 mm × 30 mm). The SIMpad was initially released with theHandheld PC 2000 (Windows CE 3.0) operating system, while later units (mostly SL4 and SLC) were released with Windows CE.NET (Windows CE 4.0). Since the SIMpad was discontinued in 2002, all manufacturer support was also discontinued.

TheOpenSIMpad project offers a SIMpad related Wiki where one can find information aboutLinux, Windows CE, hardware and mods.

• Developer's homepage

• Tablet computers
• Embedded Linux
• Siemens