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Tape on-line interrupts weren't happening when a tape was attached or replace on the TH11/TM0x emulation. The OS never saw a MOL transition in the case of replacement, where the detach is implicit. This patch defers reporting MOL for 100 msec; faster than a human can change tapes, but long enough for an OS to see the 1->0->1 transition of MOL. Further, checks for UNIT_ATT should be for MOL. This makes GALAXY automatic tape recognition work.