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EXECUTE BOOTSTRAP
EXECUTE INTERNAL DIAGNOSTICS - 14091_230

Electronics Technician Volume 06-Digital Data Systems
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PATCH   OR   REVISE   SOFTWARE.— Minicomputers  have  the  option  to  allow  you  to manually insert and make revisions to machine code or insert revisions using external peripheral devices. Patches or revisions to the software are written by authorized  personnel  only.  The  patches  or  revisions  are entered  using  inspect  and  change  routines  or equivalents using the controls, data entry, and data display man/machine interface. Mainframes The  mainframe  computers  used  for  tactical  and tactical support data systems use a number of units and panels   to   control   computer   operations.   Their controlling devices offer more options to perform the man/machine  interface  but  their  functions  are  the  same. CONFIGURE   THE   COMPUTER   SYS- TEM.— Mainframes  are  generally  designed  to  work  in large systems. In addition to a number of peripherals, they  also  work  with  major  subsystems  (display  and communications). The software is designed to manage the computer and its resources based on the amount of hardware.  Most  large  mainframe  computer  systems  use two or more computers. This  gives  the  system  the capability to run in the event one of the computers goes down with hardware problems. Therefore, it is very important  that  you  understand  and  know  how  to configure   the   system   for   full   and   reduced configurations. You accomplish this by knowing the capabilities and limitations of the software based on the quantity of hardware for your system and by ensuring all   controls   and   switches   on   the   computer(s), switchboard panels, and display and communication subsystems are correctly set. APPLY    POWER.—    Applying    power    to mainframes also requires more than just turning on the ON/OFF switch. First, you must ensure there is power to the remote panel. Then at the unit itself, usually a circuit breaker must be applied, then blower and logic power. Indicators are usually provided for blower and logic  to  show  there  is  stable  power.  Power  to  a mainframe is critical and you must ensure there is a stable power source. In addition to the circuit breaker protection,  interrupts  are  generated  if  there  are abnormal  power  fluctuations  in  which  case  the computer will shut itself down. Mainframes also use a 4-digit  time  meter  to  record  the  accumulated  hours  that logic power has been applied, except when there is a time meter for each module unit. Some mainframes have a separate power controlling device devoted entirely for power. It is usually on the front of the unit. Figure 8-29 is an example of a panel of such a device. It  also  monitors  the  temperature  of  the  computer set. Mainframes are also equipped with a  battle short switch (also indicated on figure 8-29) and an audible alarm to allow the computer to run even when the temperature exceeds the normal allowable operating temperature  established  by  the  manufacturer  and  to indicate excessive temperature in the modules. USE  CONTROLS,  DATA  ENTRY,  AND  DATA DISPLAY.—    Mainframes    will    use    operator, maintenance   panels,   and/or   display   control consoles/units located near the unit. For our example, Figure  8-29.—Example  of  the  panel  of  a  power  controlling  device. 8-23






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