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Adaptec also developed generic SCSI disk and CD-ROM drivers for DOS (ASPICD.SYS and ASPIDISK.SYS). [3]: 60–61 At least a couple of other programming interfaces for SCSI device drivers competed with ASPI in the early 1990s, including CAM (Common Access Method), developed by Apple; and Layered Device Driver Architecture, developed by Microsoft.
Some adapters cards, such as certain SCSI adapters (e.g. some made by Adaptec), were available in versions that differed only in the presence or absence of the option ROM to enable booting from attached SCSI devices. As a result of the option ROM scanning protocol, the highest-addressed option ROM is the last one to be initialized and so the ...
BusLogic, Inc. (originally BusTek, Inc.), was an American computer company active from 1988 to 1996.It specialized in the production of Small Computer System Interface (SCSI) device controller chips and controller expansion cards, becoming a dominant player in that market, behind only Adaptec.
At first, Adaptec focused on devices with Parallel SCSI interfaces. Popular host bus adapters included the 154x/15xx ISA family, the 2940 PCI family, and the 29160/-320 family. Their cross-platform ASPI was an early API for accessing and integrating non- disk devices like tape drives , scanners and optical disks .
SASI, which was used in mini- and early microcomputers, defined the interface as using a 50-pin flat ribbon connector which was adopted as the SCSI-1 connector. SASI is a fully compliant subset of SCSI-1 so that many, if not all, of the then-existing SASI controllers were SCSI-1 compatible. [7]
The PCI-X standard was developed jointly by IBM, HP, and Compaq and submitted for approval in 1998. It was an effort to codify proprietary server extensions to the PCI local bus to address several shortcomings in PCI, and increase performance of high bandwidth devices, such as Gigabit Ethernet, Fibre Channel, and Ultra3 SCSI cards, and allow processors to be interconnected in clusters.
SCSI controller (Adaptec AHA-1740) Fast SCSI RAID controller (DPT PM2022) ELSA Winner 1000 Video card for ISA and EISA EISA Network card. The Extended Industry Standard Architecture (frequently known by the acronym EISA and pronounced "eee-suh") is a bus standard for IBM PC compatible computers.
"Plus" (Zip 100 MB external drive with both SCSI and IEEE 1284 connections; SCSI ID limited to ID 5 and 6). Parallel port external Zip drives are actually SCSI drives with an integrated Parallel-to-SCSI controller, meaning a true SCSI bus implementation but without the electrical buffering circuits necessary for connecting other external devices.