MSLOAD is immediately followed by the payload, which is the DOS kernel proper, loaded as described above.The job of MSLOAD is to copy boot sector variables into its data area (the first sector), relocate itself to a higher memory address, load the rest of the file starting at segment 0x70 again and then transfer control to 0070:0000. The FAT boot sector puts the initial loader at real mode address 0070:0000, checks the first two of these signatures, then starts execution at address 0070:0200. The initial loader ( MSLOAD) comprises the first three or four 0 512-byte sectors of the file the first sector begins with the signature MZ, the second starts with the signature BJ and the last ends with the signature MS.Windows 95 and 98 IO.SYS/ WINBOOT.SYS consists of three parts: the initial loader, the payload and the device configuration manager executable.
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