On MS-DOS systems IO.SYS hooks INT 13 for billowing disc change detection, tracking formatting calls, acclimation DMA abuttals errors, alive about problems in IBM's ROM BIOS "01/10/84" with archetypal cipher 0xFC afore the aboriginal call. The arrest agent 0x13 may point to acomputer application angle rather than the BIOS routine, which some Bulgarian bacilli are accepted to use adjoin virus ecology software. 1
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