Date: Sat, 15 Dec 2001 14:26:35 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: John Baldwin <jhb@FreeBSD.org> Cc: Hiten Pandya <hitmaster2k@yahoo.com>, hackers@freebsd.org Subject: Re: boot0 Message-ID: <3C1BCE1B.53643B6D@mindspring.com> References: <XFMail.011215115834.jhb@FreeBSD.org>
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John Baldwin wrote: > No. It's the offset in memory of the number of hard drives in the BIOS. The > BIOS has a data segment at 0x40, and at 0x40:0x75 (whose physical address is > 0x475) it has a byte which is a count of the number of hard drives installed. Specifically, Hiten, see: Page 4-9, table 4.002 "BIOS Memory Usage Summary" The Programmers PC Sourcebook Thom Hogan Microsoft Press ISBN: 1-55615-321-X Or: Page 505, Table 11-9 "Hard Disk BIOS Data" The Undocumented PC Frank van Gilluwe Addison-Wesley ISBN: 0-201-62277-7 Seriously, you probably do not need to know how this works. If you are interested enough in PC hardware, and just want to know, you could do worse than buying one or both of these books. You might also want to do a web search for "Ralf Brown Interrupt List". -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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