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Groups > alt.os.development > #8216
| From | "wolfgang kern" <nowhere@never.at> |
|---|---|
| Newsgroups | alt.os.development |
| Subject | Re: BIOS limits on CD boot ? |
| Date | 2015-06-20 09:18 +0200 |
| Organization | KESYS-development |
| Message-ID | <mm3450$jrr$3@speranza.aioe.org> (permalink) |
| References | <mm0vas$t3l$1@speranza.aioe.org> <op.x0hz3wplyfako5@localhost> |
Rod Pemberton wrote: >> Let's assume a bootable OS on an ISO 9660 conform CD/DVD. > ... >> How many bytes can the BIOS load from such media ? > Are you overwriting the same block repeatedly? If so, I'd assume > an infinite number. If not, I'd assume you could load until you > either ran into the BIOS, video ROMs, or installable ROMs at 640K, > or you exceeded available memory on machine with only 512K of memory. Which BIOS function would you suggest to read from CD ? >> As I figured some time ago, INT13_42 can't load above 1.MB, >> but if the BIOS can load 500K to 0x08000... > 500K + 32K = 512K + 20K > I.e., below 640K, but above 512K which only matters for old machines. with 500k I meant 524288 bytes anyway, so my load range would be from 08000...87fff or 07c00...87bfff if the BIOS can load a boot-image that large. >> that would be enough for me yet and it could save me from >> temporary installing my CD-reader for the boot. > That's worth a few bad CDs, yes? ... It's not the value of the CDs, just the annoyance if it wont work. >> So I ask here before I burn several CDs to check if this work. > Who uses CDs anymore? Haven't you heard, everyone moved to the > "cloud" four years ago, according to Apple computer. LOL. ;-) this guys smoke too much of the carpet and may see only clouds yet. My idea is to use bootable CDs for demos and tutorials. And I wont send it to cloud-watchers of course. __ wolfgang
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BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-19 13:44 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-19 14:15 +0100
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-19 19:07 +0200
Re: BIOS limits on CD boot ? Melzzzzz <mel@zzzzz.com> - 2015-06-19 19:22 +0200
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-20 08:50 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-20 09:07 +0100
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-20 15:43 +0100
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-21 06:10 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-21 18:13 +0100
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-22 09:55 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-22 12:04 +0100
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-30 20:03 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-07-01 11:19 +0100
Re: BIOS limits on CD boot ? "Benjamin David Lunt" <zfysz@fysnet.net> - 2015-06-19 10:56 -0700
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-20 08:55 +0200
Re: BIOS limits on CD boot ? "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-06-19 18:15 -0400
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-20 09:18 +0200
Re: BIOS limits on CD boot ? "Benjamin David Lunt" <zfysz@fysnet.net> - 2015-06-20 07:43 -0700
Re: BIOS limits on CD boot ? "wolfgang kern" <nowhere@never.at> - 2015-06-21 16:04 +0200
Re: BIOS limits on CD boot ? "James Harris" <james.harris.1@gmail.com> - 2015-06-22 12:13 +0100
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