PAL models have a transfer rate of 33.6 kbit/s, and consoles sold in the US and in Japan after September 9, 1999, feature a 56 kbit/s dial-up modem. Broadband service was enabled through the later release of a broadband accessory in 2000 in Japan, and early 2001 in the US. Sega also produced the Dreameye, a digital camera that could be connected to the Dreamcast and used to exchange pictures and participate in video chat over the internet. Sega hoped developers would use the Dreameye for future software, as some later did with Sony's similar EyeToy peripheral. In addition, Sega investigated systems that would have allowed users to make telephone calls with the Dreamcast, and discussed with Motorola the development of an internet-enabled cell phone that would use technology from the console to enable quick downloads of games and other data. Storage In contrast to the Sega CD and Sega Saturn, which included internal backup memory, the Dreamcast uses a 128 kbyte memory card, the VMU, for data storage. The VMU features a small LCD screen, audio output from a one-channel PWM sound source, non-volatile memory, a D-pad and four buttons. The VMU can present game information, be used as a minimal handheld gaming device, and connect to certain Sega arcade machines. For example, players use the VMU to call plays in NFL 2K or raise virtual pets in Sonic Adventure. Sega officials noted that the VMU could be used "as a private viewing area, the absence of which has prevented effective implementation of many types of games in the past". After a VMU slot was incorporated into the controller's design, Sega's engineers found many additional uses for it, so a second slot was added. It is generally for vibration packs providing force feedback, such as Sega's "Jump Pack" and Performance's "Tremor Pack"; it can be used for peripherals including a microphone, enabling voice control and player communication. Various third-party cards provide storage, and some contain the LCD screen addition. Iomega announced a Dreamcast-compatible zip drive storing up to on removable discs, but it was never released. Software Game library The Dreamcast library consists of over 600 games across all regions, in GD-ROM format. It uses regional lockout, only playing games released within its predetermined region; however, this is circumventable via modchip installation, boot discs, or cheat discs such as Datel's Action Replay. In Japan, the Dreamcast was launched with