team added a recessed handle to the back of the computer to make the machine more personal and approachable for new computer users. The cost of the casing was more than three times that of a typical computer, but Ive credited Jobs with intuitively understanding what they were aiming for with the design and not demanding justification for the increased costs. The keyboard and mouse were redesigned for the iMac with matching translucent plastics and trim. Ive was especially proud of the round mouse, which showed the complicated internals partially shrouded behind the Apple logo. Jobs wanted the new computer to be a shift away from old or proprietary technology to a modern "legacy-free" computer; Apple's engineers adapted work done on the abandoned Common Hardware Reference Platform specification to speed up development of the computer. These included using standard SO-DIMM memory like Windows PCs of the era, and an OpenFirmware read-only memory (ROM). Previous Macintosh computers used complex machine-specific ROMs, while the new computer's instructions were loaded from memory, shortening production time. The iMac also dropped legacy serial ports, Apple Desktop Bus, and floppy disk drive. Instead, it used Universal Serial Bus (USB) ports. USB was faster and cheaper than Apple Desktop Bus and serial ports, but it was very new—the standard would not be finalized until after the iMac's release—and USB was at the time unsupported by any third-party Mac peripheral. Jobs wagered that the unproven connector would solve the problem of accessory makers abandoning the increasingly small Mac market with its special connectors. The iMac did not officially have an expansion slot, but early versions of the machine had a "mezzanine slot". While it was intended only for internal use, a few third-party expansion cards were released for it, such as video card upgrades and SCSI ports. Early models also featured an IrDA infrared port that allowed personal digital assistants and other devices to wirelessly transmit information to the computer. Jobs was furious that the initial iMac model came with a tray-loading CD-ROM instead of a more modern slot-loading drive, and nearly canceled the product launch over it. Despite Jon Rubinstein insisting that Jobs had always known about the CD tray, Jobs ultimately only went ahead with the launch after he was assured they would switch subsequent models to a slot-loading drive as soon as possible. In early 1998, representatives from the advertising agency TBWA\Chiat\Day were given an