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    The bootstrap routine reads Sector 1, Track 0 into memory at location
    0000:7C00H and transfers control to the same address. If attempts to read
    a boot sector from the floppy disk or fixed disk are unsuccessful,
    control is transferred to ROM BASIC by execution of an Int 18H.
 
    If location 0000:0472H does not contain the value 1234H, a memory test
    will be performed before reading the boot sector.
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