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Groups > comp.arch.embedded > #18725
| From | Tauno Voipio <tauno.voipio@notused.fi.invalid> |
|---|---|
| Newsgroups | comp.arch.embedded |
| Subject | Re: x86 real mode |
| Date | 2014-10-17 18:35 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <m1rd0c$27b$1@dont-email.me> (permalink) |
| References | <m1r8pj$che$1@speranza.aioe.org> <54412845$0$2932$e4fe514c@news.xs4all.nl> <m1ra20$fr8$1@speranza.aioe.org> <54412d55$0$2854$e4fe514c@news.xs4all.nl> <m1rcj9$n3h$1@speranza.aioe.org> |
On 17.10.14 18:28, Don Y wrote: > Not a question of toolchain but, rather, what the *environment* > already "expects" (provides). Hence the "*practical*" qualifier in > my original post. > > Thanks! I can do a LOT in 64K. Just need to know that "going in" > instead of "after the fact"... > >>> [I don't really care what it is, just need to know the constraints >>> before I settle on a design. E.g., I surely wouldn't use int's >>> if values would fit in char's and every byte of data "cost" me >>> a byte of code!!] >> >> I would start by looking for a toolchain, and see what it supports. One question is whether your target processor is 8086/88/186/188 or something bigger. The former wrap addresses at 1 MiB, so the old PC/AT trick to address 65520 bytes above 1048576 works only on the bigger processors. Some older 8086 code (including base PC BIOS) used small model segmenting for ROM just below 1 MiB and RAM at 0. This is the cause why there is a thing called A20 gate in PC/AT and derivatives. -- Tauno Voipio
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x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 07:23 -0700
Re: x86 real mode Arlet Ottens <usenet+5@c-scape.nl> - 2014-10-17 16:31 +0200
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 07:45 -0700
Re: x86 real mode Arlet Ottens <usenet+5@c-scape.nl> - 2014-10-17 16:53 +0200
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 08:28 -0700
Re: x86 real mode Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-10-17 18:35 +0300
Re: x86 real mode Arlet Ottens <usenet+5@c-scape.nl> - 2014-10-17 17:36 +0200
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 13:54 -0700
Re: x86 real mode Grant Edwards <invalid@invalid.invalid> - 2014-10-17 21:02 +0000
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 14:54 -0700
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 10:09 +0300
Re: x86 real mode Grant Edwards <invalid@invalid.invalid> - 2014-10-17 16:11 +0000
Re: x86 real mode Stefan Reuther <stefan.news@arcor.de> - 2014-10-17 18:37 +0200
Re: x86 real mode Les Cargill <lcargill99@comcast.com> - 2014-10-17 12:58 -0500
Re: x86 real mode David Brown <david.brown@hesbynett.no> - 2014-10-17 16:52 +0200
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 16:45 +0000
Re: x86 real mode Robert Wessel <robertwessel2@yahoo.com> - 2014-10-17 10:03 -0500
Re: x86 real mode Grant Edwards <invalid@invalid.invalid> - 2014-10-17 16:07 +0000
Re: x86 real mode upsidedown@downunder.com - 2014-10-17 19:57 +0300
Re: x86 real mode Les Cargill <lcargill99@comcast.com> - 2014-10-17 12:57 -0500
Re: x86 real mode Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-10-17 21:18 +0300
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 21:48 +0000
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 15:06 -0700
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 22:25 +0000
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 15:39 -0700
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-17 22:47 -0400
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 21:10 -0700
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 11:32 +0300
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 11:10 +0300
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-18 08:20 -0700
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 20:34 +0300
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-18 12:53 -0700
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 10:30 +0300
Re: x86 real mode David Brown <david.brown@hesbynett.no> - 2014-10-18 20:22 +0200
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 10:22 +0300
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-18 09:06 +0000
Re: x86 real mode Robert Wessel <robertwessel2@yahoo.com> - 2014-10-18 08:43 -0500
Re: x86 real mode Gerd Brix <gbrix@gmx.eu> - 2014-10-18 16:39 +0200
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-18 17:52 -0700
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-20 01:35 -0400
Re: x86 real mode upsidedown@downunder.com - 2014-10-20 10:14 +0300
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-20 14:12 -0400
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-20 08:15 -0700
Re: x86 real mode Les Cargill <lcargill99@comcast.com> - 2014-10-17 18:39 -0500
Re: x86 real mode Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-10-18 10:46 +0300
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-17 15:29 -0400
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-17 14:32 -0700
Re: x86 real mode Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2014-10-18 00:09 +0200
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 22:31 +0000
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 12:04 +0300
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-18 23:22 +0000
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-18 20:59 -0700
Re: x86 real mode upsidedown@downunder.com - 2014-10-18 11:53 +0300
Re: x86 real mode Don Y <this@is.not.me.com> - 2014-10-18 09:34 -0700
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 22:00 +0000
Re: x86 real mode Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2014-10-18 00:26 +0200
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-17 22:36 +0000
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-17 21:45 -0400
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-18 03:26 +0000
Re: x86 real mode Robert Wessel <robertwessel2@yahoo.com> - 2014-10-17 23:26 -0500
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-18 05:42 +0000
Re: x86 real mode Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-10-18 10:53 +0300
Re: x86 real mode glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-10-18 09:12 +0000
Re: x86 real mode Robert Wessel <robertwessel2@yahoo.com> - 2014-10-17 22:40 -0500
Re: x86 real mode George Neuner <gneuner2@comcast.net> - 2014-10-17 22:07 -0400
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