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When there is no second physical floppy drive, drive B: can be used as a "virtual" floppy drive mapped onto the physical drive A:, whereby the user would be prompted to switch floppies every time a read or write was required to whichever was the least recently used of A: or B:. This allows for much of the functionality of two floppy drives on a ...
This functionality also worked with a mixed combination of PET, VIC-20, and other selected Commodore 8-bit computers. In the mid-1980s, a 2.8-inch floppy disk drive, the Triton Disk Drive and Controller, was introduced by Radofin Electronics, Ltd. It was compatible with the Commodore 64 as well as other popular home computers of the time ...
Mapping a drive can be complicated for a complex system. Network mapped drives (on LANs or WANs) are available only when the host computer (File Server) is also available (i.e. online): it is a requirement for use of drives on a host. All data on various mapped drives will have certain permissions set (most newer systems) and the user will need ...
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
The first drive attached to a system is a "master drive" which contains the controller and can control a number of Model 2 "slave drives." [34] Master drive on an IBM 1440, IBM 1460, or IBM 1240 system and can control up to four Model 2 drives. Introduced October 11, 1962. Withdrawn February 8, 1971. Slave drive to a master drive.
Priam Corporation was a company located in San Jose, California, founded in 1978 by William Schroeder and Al Wilson, two former Memorex executives, as a manufacturer of hard disk drives. [1] [2] Originally, they made high-capacity 14-inch drives, developed for mainframe computers, available for minicomputers and high-end workstations, [2] but ...
Happy drives are series of disk drive enhancements for the Atari 8-bit and Atari ST computer families produced by a small company called Happy Computers. Happy Computers is most noted for the add-in boards for the Atari 810 and Atari 1050 floppy disk drives, which achieved a tremendous speed improvement for reading and writing, and for the ability to backup floppies.
The VDP (all-in-one) computer had sold poorly and was not competitive with the Radio Shack TRS-80, Commodore PET, and Apple II computers. The 'IMSAI' trademark was acquired by Thomas "Todd" Fischer and Nancy Freitas (former early employees of IMS Associates), who continued manufacturing the computers under the IMSAI name as a division of ...