internal flash storage of the SL-C750 and a larger battery, sold only in Japan. (2004) SL-C860 (Boxer), similar to SL-C760, it contains a software upgrade which allows it to be recognised as a USB storage device and has built in English-Japanese translation software, sold only in Japan. (2004) SL-6000 (Tosa) (2005), the successor to the SL-5600, available in 3 versions: SL-6000N, 4" VGA display, Intel XScale PXA255 400 MHz processor, 64 MB flash memory, 64 MB SDRAM, CF and SD slots, and IR port. Built in microphone, speaker, USB host port. There seems to be a version called HC-6000N equipped with Microsoft Windows Mobile 2003 Second Edition, and a handheld from Hitachi called FLORA-ie MX1 with same hardware, both are only available in Japan. SL-6000L, same as SL-6000N, also with built-in 802.11b Wi-Fi. SL-6000W, same as SL-6000N, also with built-in 802.11b Wi-Fi and Bluetooth. SL-C3000 (Spitz), similar to SL-C860, the SL-C3000 contains a USB host port to allow the connection of USB devices such as keyboards and mice. It also features an Intel Xscale PXA270 416 MHz CPU. While that model features only 16 MB flash storage it has a 4 GB Hitachi HDD and was the first PDA to feature a hard disk. It is sold only in Japan. SL-C1000 (Akita), similar to SL-C3000, but with 128 MB Flash ROM instead of HDD. SL-C3100 (Borzoi), similar to SL-C3000, Flash ROM has been increased 128 MB, still has 4 GB HDD. SL-C3200 (Terrier), latest clam-shell model, released on March 17, 2006, similar to SL-C3100. HDD has been increased to 6 GB, comes with updated dictionary, text to speech software from Nuance Communications and TOEIC (Test of English for International Communication) test. Operating systems These are frequently called 'ROMs' in the community because the Zaurus' OS is usually stored in embedded flash memory, and are installed using a flashing tool. There's also a special "rescue" mode NOR flash (or P2ROM in newer models) in all Zauruses since the 5xxx series which allows recovery from a corrupted OS. OpenZaurus, which uses the OPIE or GPE graphical user interfaces and is designed for the power user. OpenZaurus does not include the proprietary software that comes with Sharp's distribution. OpenZaurus development has been dropped in favour of Ångström which is also based on the OpenEmbedded build environment, but supports a larger range of devices, not limited to Zauri. Ångström distribution, the replacement for OpenZaurus.