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DEC VT52 terminal The earliest computer systems did not support interactive enter/output equipment, generally counting on feeling switches and lights to talk to the computer operator. This was ample for batch programs that ran just one method at any given time, generally Along with the programmer acting as operator.A lot of graphical interfaces, li

The zigzagging from the overhead line is not expected for trolley poles. For tramways, a Call wire without having a messenger wire is utilised.The two wires usually do not contact (Even though the bow collector or pantograph is briefly in connection with equally wires). In typical support, the two sections are electrically related; depending on the