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Hewlett-Packard (HP) developed the first ScanJet in the mid-1980s at their printer division in Boise, Idaho. [4] [5] The ScanJet was released in March 1987, [6] as a compliment to their LaserJet series, which was the first commercially successful line of laser printers ever released, [7] introduced in 1984 and also developed at Boise.
Alexander Murray and Richard Morse invented and patented the first analog color scanner at Eastman Kodak in 1937. Intended for color separation at printing presses, their machine was an analog drum scanner that imaged a color transparency mounted in the drum, with a light source placed underneath the film, and three photocells with red, green, and blue color filters reading each spot on the ...
The first working fax machine, invented by the English physicist Frederick Bakewell in 1847, was in essence an early drum scanner. Instead of scanning a paper print or transparency using light, however, the revolving drum of Bakewell's machine is coated in tinfoil, with non-conductive ink painted on the foil and a stylus that scans across the drum and sends a pulse down a pair of wires when it ...
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On a parallel SCSI bus, a device (e.g. host adapter, disk drive) is identified by a "SCSI ID", which is a number in the range 0–7 on a narrow bus and in the range 0–15 on a wide bus. On earlier models a physical jumper or switch controls the SCSI ID of the initiator (host adapter).
Vertical: 100 or 98 scan lines per inch ("Standard") Vertical: 200 or 196 scan lines per inch ("Fine") Vertical: 400 or 391 (note not 392) scan lines per inch ("Superfine") Horizontal: 300 scan lines per inch Vertical: 300 scan lines per inch; Horizontal: 400 or 408 scan lines per inch Vertical: 400 or 391 scan lines per inch ("Ultrafine")
In Helical scan, these tracks are positioned diagonally, relative to the length of the tape. The diagonal tracks read or written using this method are known as helical tracks. [2] The head drum of a Hi-Fi NTSC VHS VCR; three of the six heads face the reader. The helical path of the tape around the drum can clearly be seen.