The figure below is a broadband buffer circuit. The circuit is composed of transistors and FETs. This broadband amplifier has a high input impedance and a low input impedance. 
Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
SCSI-180°DIP Section
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