Sujet : Re: 80286 protected mode
De : terje.mathisen (at) *nospam* tmsw.no (Terje Mathisen)
Groupes : comp.archDate : 08. Oct 2024, 09:44:54
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <ve2re6$24hio$3@dont-email.me>
References : 1 2 3 4 5 6
User-Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 SeaMonkey/2.53.19
Lawrence D'Oliveiro wrote:
On Mon, 7 Oct 2024 15:17:36 +0200, Terje Mathisen wrote:
640K was an artifact of the frame buffer placement selected by the
original IBM PC, it could just as well have been 900+ K.
Another MS-DOS machine, the DEC Rainbow, could be upgraded to 896KiB of
RAM. I know because our Comp Sci department had one.
That was the one with the dual Z80 and 8086 (8088?) chips, so it could run
3 different OSes: CP/M-80, CP/M-86, and MS-DOS. Not more than one at once,
though (that would have been some trick).
But it was not fully hardware-compatible with the IBM PC.
When I was hired by Hydro in 1984, my boss decided that he liked the Rainbow best, so he took responsibility for that model, while I got all IBM compatibles: Hardware/Software/add-on cards/etc for a company with 77K employees in 130 countries.
By the time Hydro was broken up into 3-4 separate companies (around 2008?) I had to share that responsibility with 2-300 other people.
Terje
-- - <Terje.Mathisen at tmsw.no>"almost all programming can be viewed as an exercise in caching"
Date | Sujet | # | | Auteur |
16 Apr 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 237 | | Lawrence D'Oliveiro |
16 Apr 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 236 | | David Brown |
16 Apr 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | MitchAlsup1 |
26 May 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | MitchAlsup1 |
1 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 233 | | MitchAlsup1 |
1 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 232 | | Thomas Koenig |
1 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 225 | | MitchAlsup1 |
2 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 223 | | Brett |
3 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 222 | | Lawrence D'Oliveiro |
3 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | Brett |
3 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | Anton Ertl |
3 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 219 | | David Brown |
3 Oct 24 | Byte ordering (was: Whether something is RISC or not) | 218 | | Anton Ertl |
3 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 1 | | David Brown |
4 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 215 | | Lawrence D'Oliveiro |
4 Oct 24 | Re: Byte ordering | 1 | | Lynn Wheeler |
4 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 211 | | David Brown |
4 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 210 | | Anton Ertl |
4 Oct 24 | Re: Byte ordering | 5 | | BGB |
5 Oct 24 | Re: Byte ordering | 4 | | MitchAlsup1 |
5 Oct 24 | Re: Byte ordering | 2 | | BGB |
5 Oct 24 | Re: Byte ordering | 1 | | Lawrence D'Oliveiro |
5 Oct 24 | Re: Byte ordering | 1 | | Lawrence D'Oliveiro |
5 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 13 | | Lawrence D'Oliveiro |
5 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 12 | | Brett |
5 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 11 | | Anton Ertl |
5 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 10 | | Michael S |
6 Oct 24 | Re: Byte ordering | 1 | | Terje Mathisen |
6 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 8 | | Brett |
7 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 7 | | Lawrence D'Oliveiro |
7 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 6 | | Brett |
7 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 5 | | Michael S |
7 Oct 24 | Re: Byte ordering | 2 | | Stefan Monnier |
7 Oct 24 | Re: Byte ordering | 1 | | Michael S |
7 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 2 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: Byte ordering | 1 | | Terje Mathisen |
6 Oct 24 | Re: Byte ordering | 191 | | David Brown |
6 Oct 24 | Re: Byte ordering | 190 | | Anton Ertl |
6 Oct 24 | Re: Byte ordering | 189 | | John Dallman |
7 Oct 24 | Re: Byte ordering | 20 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: Byte ordering | 19 | | John Dallman |
9 Oct 24 | VMS/NT memory management (was: Byte ordering) | 1 | | Stefan Monnier |
15 Oct 24 | Re: Byte ordering | 2 | | Lawrence D'Oliveiro |
15 Oct 24 | Re: Byte ordering | 1 | | MitchAlsup1 |
15 Oct 24 | Re: Byte ordering | 15 | | Lawrence D'Oliveiro |
15 Oct 24 | Re: Byte ordering | 3 | | Michael S |
15 Oct 24 | Re: Byte ordering | 1 | | John Dallman |
18 Oct 24 | Re: Byte ordering | 1 | | Lawrence D'Oliveiro |
15 Oct 24 | Re: Byte ordering | 9 | | John Dallman |
16 Oct 24 | Re: Byte ordering | 7 | | George Neuner |
16 Oct 24 | Re: Byte ordering | 6 | | Terje Mathisen |
16 Oct 24 | Re: Byte ordering | 5 | | David Brown |
17 Oct 24 | Re: Byte ordering | 2 | | George Neuner |
17 Oct 24 | Re: Byte ordering | 1 | | David Brown |
17 Oct 24 | Re: clouds, not Byte ordering | 2 | | John Levine |
17 Oct 24 | Re: clouds, not Byte ordering | 1 | | David Brown |
18 Oct 24 | Re: Byte ordering | 1 | | Lawrence D'Oliveiro |
16 Oct 24 | Re: Byte ordering | 2 | | Paul A. Clayton |
18 Oct 24 | Re: Microkernels & Capabilities (was Re: Byte ordering) | 1 | | Lawrence D'Oliveiro |
7 Oct 24 | 80286 protected mode | 168 | | Anton Ertl |
7 Oct 24 | Re: 80286 protected mode | 5 | | Lars Poulsen |
7 Oct 24 | Re: 80286 protected mode | 4 | | Terje Mathisen |
7 Oct 24 | Re: 80286 protected mode | 1 | | Michael S |
7 Oct 24 | Re: 80286 protected mode | 2 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: 80286 protected mode | 1 | | Terje Mathisen |
7 Oct 24 | Re: 80286 protected mode | 3 | | Brett |
7 Oct 24 | Re: 80286 protected mode | 2 | | Michael S |
7 Oct 24 | Re: 80286 protected mode | 1 | | Brett |
7 Oct 24 | Re: 80286 protected mode | 1 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: 80286 protected mode | 152 | | MitchAlsup1 |
8 Oct 24 | Re: 80286 protected mode | 4 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: 80286 protected mode | 3 | | MitchAlsup1 |
9 Oct 24 | Re: 80286 protected mode | 1 | | David Brown |
15 Oct 24 | Re: 80286 protected mode | 1 | | Lawrence D'Oliveiro |
8 Oct 24 | Re: 80286 protected mode | 147 | | Anton Ertl |
8 Oct 24 | Re: 80286 protected mode | 1 | | Robert Finch |
9 Oct 24 | Re: 80286 protected mode | 145 | | David Brown |
9 Oct 24 | Re: 80286 protected mode | 79 | | MitchAlsup1 |
9 Oct 24 | Re: 80286 protected mode | 78 | | David Brown |
9 Oct 24 | Re: 80286 protected mode | 77 | | Stephen Fuld |
10 Oct 24 | Re: 80286 protected mode | 2 | | MitchAlsup1 |
10 Oct 24 | Re: 80286 protected mode | 1 | | David Brown |
10 Oct 24 | Re: 80286 protected mode | 1 | | David Brown |
11 Oct 24 | Re: 80286 protected mode | 73 | | Tim Rentsch |
15 Oct 24 | Re: 80286 protected mode | 72 | | Stefan Monnier |
15 Oct 24 | Re: 80286 protected mode | 30 | | MitchAlsup1 |
16 Oct 24 | Re: 80286 protected mode | 25 | | MitchAlsup1 |
16 Oct 24 | Re: C and turtles, 80286 protected mode | 13 | | John Levine |
16 Oct 24 | Re: C and turtles, 80286 protected mode | 7 | | MitchAlsup1 |
16 Oct 24 | Re: C and turtles, 80286 protected mode | 6 | | John Levine |
17 Oct 24 | Re: C and turtles, 80286 protected mode | 5 | | Thomas Koenig |
20 Oct 24 | Re: C and turtles, 80286 protected mode | 4 | | Lawrence D'Oliveiro |
20 Oct 24 | Re: C and turtles, 80286 protected mode | 3 | | George Neuner |
22 Oct 24 | Re: C and turtles, 80286 protected mode | 2 | | Tim Rentsch |
22 Oct 24 | Re: C and turtles, 80286 protected mode | 1 | | George Neuner |
16 Oct 24 | Re: C and turtles, 80286 protected mode | 1 | | David Brown |
16 Oct 24 | Re: C and turtles, 80286 protected mode | 4 | | Paul A. Clayton |
17 Oct 24 | Re: C and turtles, 80286 protected mode | 1 | | David Brown |
20 Oct 24 | Re: C and turtles, 80286 protected mode | 2 | | Lawrence D'Oliveiro |
20 Oct 24 | Re: C and turtles, 80286 protected mode | 1 | | Paul A. Clayton |
16 Oct 24 | Re: 80286 protected mode | 7 | | Thomas Koenig |
17 Oct 24 | Re: 80286 protected mode | 3 | | George Neuner |
17 Oct 24 | Re: 80286 protected mode | 1 | | Tim Rentsch |
16 Oct 24 | Re: 80286 protected mode | 3 | | David Brown |
17 Oct 24 | Re: 80286 protected mode | 1 | | Tim Rentsch |
16 Oct 24 | Re: 80286 protected mode | 41 | | David Brown |
9 Oct 24 | Re: 80286 protected mode | 51 | | Thomas Koenig |
13 Oct 24 | Re: 80286 protected mode | 14 | | Anton Ertl |
8 Oct 24 | Re: 80286 protected mode | 6 | | John Levine |
6 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 2 | | Michael S |
4 Oct 24 | Re: Byte ordering (was: Whether something is RISC or not) | 1 | | John Dallman |
2 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | Thomas Koenig |
2 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 5 | | David Schultz |
3 Oct 24 | Re: Whether something is RISC or not (Re: PDP-8 theology, not Concertina II Progress) | 1 | | Lawrence D'Oliveiro |