Article View: comp.sys.ibm.pc
Article #41231Re: System boot
From: Ralf.Brown
Date: Wed, 10 Jan 1990 12:37
Date: Wed, 10 Jan 1990 12:37
24 lines
1579 bytes
1579 bytes
In article <9312@leadsv.UUCP>, zech@leadsv.UUCP (Bill Zech) wrote:
}INT 19
} This is a DOS boot ONLY. The BIOS interrupts are *NOT*
} reset. Note that INT 19 is a DOS interrupt, not a BIOS int.
It is *not* a DOS interrupt. INT 19h is a BIOS interrupt, but points right at
the code with loads and then executes the boot sector. DOS does not know or
care about INT 19h (except insofar as VDISK.SYS uses a stub INT 19 handler to
locate the data from previous invocations).
}Any TSR or driver which chains onto an interrupt vector must
}intercept int 19, and reload the interrupt vectors with their
}original values, before allowing DOS to handle the int 19.
}Not all TSRs and drivers are friendly enough to do this, and that
Essentially none, in fact.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!b.gp.cs.cmu.edu!Ralf.Brown@B.GP.CS.CMU.EDU From: Ralf.Brown@B.GP.CS.CMU.EDU Newsgroups: comp.sys.ibm.pc Subject: Re: System boot Message-ID: <25ab3ab5@ralf> Date: 10 Jan 90 12:37:57 GMT Sender: ralf@b.gp.cs.cmu.edu Organization: Carnegie Mellon University School of Computer Science Lines: 24 In-Reply-To: <9312@leadsv.UUCP>