1. xerox 560 computer system - The UK Mirror Service

BP STATUS AND NO.Th i s group of i ndi cators perm i ts the processor address(usually 0) and current internal state (RUN, WAIT, orHALT) of the BP to be displayed. While executing instructions,the BP is normally in the RUN or WAIT state.The HALT state is entered only when an address halt occurs,the processor disable is on (see II Operating Procedures andInformation lr ) or an irrecoverable processor fault occurs.When the system is in the IDLE state as a result of poweron, a ZCHLT command, or a pc command, only the processoraddress is lighted and RUN, WAIT, and HALT indicatorsare extinguished.ALARM AUDIOThis 4-position rotary switch controls the connection andvolume of a loudspeaker, and also permits all indicators(except POWER ON and PRIMARY POWER) on the SCP tobe tested. When this switch is in the OFF position, theloudspeaker is disconnected. Note that this switch doesnot inhibit the ALARM indicator. When this switch is inthe LOW position, the loudspeaker is connected and thevolume is set to a low level. When this switch is in theHIGH position, the loudspeaker is connected and thevolume is set to a high level. When this switch is held inthe LAMP TEST position, all back-lighted indicators shouldilluminate, simultaneously. The switch returns to theHIGH position when released.SCC FUNCTIONSThis sWitch controis the functionai capabiiities of the SystemControl Console(s). When this switch is in the ENABLEposition, the SCC device(s) may perform the various controlfunctions attributed to a System Control Console.Certain control functions require the system to be in theIDLE state while others (as described under "MaintenanceControl Commands") require the MAINT MODE switch tobe in the ON position.When the SCC FUNCTIONS switch is in the DISABLEposition, the control functions that may be entered fromthe control console (to interact with operating software)are limited to the following:1. Operator requested interrupt (ZcI),2. Read Sense Switches (ZcSSW),3. Set Sense Switches (ZcSS#).The operator may lock out potentially disruptive controlcommands when the operating software isrunning by settingthe SCC FUNCTIONS switch to DISABLE.consoles may be connected in parallel with the SystemControl Console and may perform the same control func':"tions as the local control device. The remote console alsorequires a manual connection through the RD1 data set.Note that any restrictions upon the control functions imposedupon the local control device by the SCC FUNC­TIONS switch being in the DISABLE position also applyto both consoles. Either the alternate or remote consoleis selected for input by the AL TSEL switch on the ConfigurationControl Panel (see Chapter 6).When the REMOTE CHANNEL switch is in the OFF position,the remote device is disconnected from the ECS at the dataset (if present). The alternate console functions in the I/omode.When this switch is in the I/o position, the alternate andremote consoles operate strictly as I/O devices communicatingwith the computer system via lOP subchannel addressX'OB'. Only one device is selected for input at a time bythe ALTSEL switch on the Configuration Control Panel(see Chapter 6).MAINT MODEDuring normal operations, this switch is placed in the OFFposition. During maintenance and/or diagnostic activies,this switch may be placed in the ON position or momentariIy held in the RESET position (switch automatically returnsto the ON position when released). In addition to causingthe MAINTENANCE MODE indicator to become illuminatedwhen piaced in the ON position, the sWitch aiso enablescertain hardware controls and allows their associatedcontrol commands to be entered from the operator's controlconsole (see "Maintenance Control Commands"). Thisinterlocking feature prevents inadvertent adverse effectsupon the current program.Caution should be exercised in activating RESET, sincethis position (equivalent to the SCC SUPER RESET command)causes all components of the system to be reset andinitialized.SELECT DISPLAYThese nine switches, labeled CCP/SCSR and 0 through 7,are used to specify the binary address of anyone of up to256 Single Clock Status Registers and up to 32 ConfigurationStatus Registers or Read Direct Mode 9 Status Registerswhose content is to be displayed by the 32 binaryindicators, labeled 0 through 31.REMOTE CHANNELThis 3-position rotary switch controls the manner in whichthe alternate and remote consoles may operate. When thisswitch is in the SCC position, the alternate and remoteWhen the CCP/SCSR switch is in the SCSR position,switches 0 through 3 specify the cluster address andswitches 4 through 7 specify the element address of theSingle Clock Status Register whose content is to bedisplayed.Control Commands 163