The product was marketed internationally from 1984 to 1986. A separate expansion box provided dual 5.25-inch floppy or 10 MB hard disk storage. The Magnum could suspend and retain memory in battery-backed CMOS RAM, including a RAM Disk (D:). It was based on the MS-DOS operating system and applications stored in ROM (A:) and also supported removable modules in expansion slots (B: and C:) that could be custom-programmed EPROM or standard word processing and spreadsheet applications. The Dulmont was thus the first computer that could be taken anywhere and offered significant computing potential on the user's laptop (though weighing in at 4.8 kg (11 lb)). This battery-powered device included an 80 character × 8 line display in a lid that closed against the keyboard. The first contender for true laptop computing was the 16-bit Dulmont Magnum, designed by David Irwin and John Blair of Dulmison, Australia, in 1982 and released in Australia in September 1983 by Dulmont. The Osborne 1 weighs close to 11 kg (24 lb) and was priced at US$1,795 (equivalent to $5,778 in 2022). The Osborne was about the size of a portable sewing machine, and could be carried on commercial aircraft. This and other "luggables" were inspired by what was probably the first portable computer, the Xerox NoteTaker. Although it was large and heavy compared to today's laptops, with a tiny 5" CRT monitor, it had a near-revolutionary impact on business, as professionals were able to take their computer and data with them for the first time. The computer company was a failure and did not last for very long. ![]() An aftermarket battery pack was available. The Osborne 1 had a five-inch screen, incorporating a modem port, two 5 + 1⁄ 4-inch floppy drives, and a large collection of bundled software applications. ![]() Adam Osborne founded Osborne Computer and produced the Osborne 1 in 1981. The Osborne 1 is considered the first true mobile computer by most historians.
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