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IBM System/36
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===Front panel=== The 5360, 5362, and 5363 processors had a front panel display with four hexadecimal LEDs. If the operator "dialed up" the combination F-F-0-0 before performing an [[IBM System/360 architecture#Initial Program Load|Initial Program Load]] (IPL, or [[Booting|system boot]]), many [[diagnostics]] were skipped, causing the duration of the IPL to be about a minute instead of about 10 minutes. Of course part of the IPL was typically keysorting the indexed files and if the machine had been shut down without a "keysort" (performed part of the P S (or STOP SYSTEM) then depending on the number of indexed files (and their sizes) it could take upwards of an hour to come back up.
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