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IBM System/7 Functional Characteristics - All about the IBM 1130 ...

IBM System/7 Functional Characteristics - All about the IBM 1130 ...

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1111■111111,11,11N I IIIADDRESS LightsThese 16 lights display <strong>the</strong> last storage address accessed for data or for an instruction.ROTARY SWITCH AREAThe rotary switch area is shown in Figure 5-3.I HOST ATTACHSTORE/DISPLAYENABLE •OP DISP•AND IPL e-N ONLYENABLEXR7 •SELECTMAIN STORAGEIAR • e • ACCDISABLE • XR6 • • XR2XR5 • • .XR3XR4LAMP TEST I I CHECK CONTROL I I RATE CONTROLPROCESSPROCESSCHECK•••STOP ONSTOP ON • INSTRRESTART ERRORSTOR ADDR• •STEPAe-N.Figure 5-3. Rotary switch areaSTORAGE DATA/ADDRESS SwitchesThese four rotary switches set up data for entry into <strong>the</strong> system via <strong>the</strong> operator console,or establish an address for use with <strong>the</strong> rate control switch. Each rotary switch has settingsfrom 0 to F so that <strong>the</strong> data word or address to be established can be selected by itshexadecimal value.Data set up by <strong>the</strong> rotary switches is stored into a storage location or <strong>the</strong> registerindicated by <strong>the</strong> store/display select and store/display level switches. Storing occurswhen <strong>the</strong> store key is pressed.The two right-hand storage data/address switches are also labeled load unit address. Theseswitches are used during any IPL operation to select <strong>the</strong> source of <strong>the</strong> storage load. Theload unit address switches must be set to 00 for an IPL from ei<strong>the</strong>r <strong>the</strong> operator stationtape reader or a host processor. For an IPL from a disk storage module, <strong>the</strong> load unitaddress switches must be set to <strong>the</strong> I/O module address containing <strong>the</strong> disk storage moduleto be used. (See "PROGRAM LOAD Key" later in this chapter.)5-6 GA34-0003

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