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  • @Kevin - thanks for cleaning up my poor grammar 8-) Commented Nov 8, 2013 at 20:14
  • DOS functions are not alongside BIOS functions, they are on top of BIOS functions. The BIOS provides the machine-dependent part of the OS (CP/M, PC-DOS, MS-DOS), and the BDOS/DOS part provides the machine-independent part, built on top of what the BIOS provides. Commented Nov 11, 2013 at 16:56
  • @ninjalj - for the sake of the conversation it's doesn't really matter, only highlighting it so that the OP understands that a computer system is just that, a system, not a monolithic thing. Commented Nov 11, 2013 at 17:27