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From: milton@ecn.purdue.edu (Milton D Miller)
Newsgroups: comp.protocols.nfs,comp.os.msdos.programmer
Subject: Re: Booting PC-NFS off ROM?
Message-ID: <1990Jul29.212217.5417@ecn.purdue.edu>
Date: 29 Jul 90 21:22:17 GMT
References: <90207.161845TOMIII@MTUS5.BITNET>
Organization: Purdue University Engineering Computer Network
Lines: 19

In article <90207.161845TOMIII@MTUS5.BITNET> TOMIII@MTUS5.BITNET (Thomas Dwyer III) writes:
>Does anyone know of a method do boot PC-NFS off a ROM?  Suppose we write
>our own PROM to download a bootdisk image into memory.  How would we then
>get the PC to use this disk image instead of the A: drive?  Or suppose
>we steal INT 13 and just feed the BIOS our own bootstrap code when it
>tries to read the boot sector.  This code would then download IBMBIO.COM
>and run it, but then how do we feed it IBMDOS.COM, etc?
>
>Any comments/suggestions/etc?
>
Rather then catching INT13, why not start with INT 19, the boot interrupt?
(The ROM routine for INT19 tries the disk, and is intercepted by the 
hard disk controller rom to enable booting from the hard disk).

I haven't looked into this in too much detail, so I can't tell you  how
to load IBMDOS after you give it IBMBIO, mabye you could do
a combined image?

milton