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Mainframes
INITIATE  OPERATIONAL  PROGRAMS

Fire Controlman Volume 03-Digital Data Systems
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we show a display control unit (DCU) in figure 8-30. Remote units are also available to provide initial startup just  like  the  operator  and  display  control  units.  Control, data entry, and data display man/machine interfaces of mainframes  are  your  primary  means  of  operating  and maintaining  a  mainframe  computer.  You  can  control  all operations  from  this  man/machine  interface.  Newer mainframes, in addition to controls, switches, and pushbutton indicators, use displays and keyboards to display status and to address the contents of registers. EXECUTE INTERNAL DIAGNOSTICS. —On mainframes, internal diagnostics are also available using built-in tests (BITs) or tests available on an NDRO.  They  are  designed  to  test  the  computer hardware (CPU, IOCs, and any optional circuits) and return pass/fail results to the operator. Pass/fail results are displayed on the control, data entry, and data display man/machine interface shown on figure 8-30. Similar to minicomputers, the BIT itself can consist of several levels  of  tests  and  subtests  controlled  from  the computer’s front panel. Some internal diagnostics are designed to test all or selected sections of the computer. Errors can be displayed on the front panel using the data display  man/machine  interface.  The  computer’s technical manuals will enable you to decipher the error Figure  8-30.—Example  of  a  display  control  unit. 8-24






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