Waar is de Sys Rq knop voor? 8)7

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Kan iemand mij vertellen waar de Sys Rq knop voor is? Dus Ctrl-Print Screen. En geen gelul over Windows want die knop zat er al op m'n 286:)

[mvdejong]

Deze toets wordt in verschillende UNIX-versies (mij onder andere bekend : InterActive UNIX, NCR MP-RAS) en gebruikt om tussen verschillende logische beeldschermen te switchen.
In MP-RAS doe je Alt-SysReq, en dan "h" om naar de console te gaan, of F1 enz. om naar virtuele sessies te switchen.

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Je kan die knop nu ook gebruiken onder GNU/Linux. Je kan dat aanzetten in de kernel. Als je dan bepaalde combinaties met die knop intoetst worden bijvoorbeeld partities geunmount of gereboot. Als alles aan je bak hangt, kan je (soms) toch nog de kernel besturen en netjes rebooten.

Zie bijvoorbeeld http://cbbrowne.com/info/linuxkernel.html

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Maar heeft ie ook nog een functie in MS-DOS?

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Gebruik je nog DOS dan?

Het is gewoon een knop, het ligt er maar aan wat de applicatie er mee doet

[JeroenNietDoen]

Over dit soort knoppen gesproken, scrolllock zou ik ook niet weten wat ik hier mee moet doen

[mvdejong]

ScrollLock is een zeer nuttige toets. Als je een (DOS-)programma hebt dat vele schermen output uitbraakt, kun je hiermee de output pauseren en weer verder laten gaan.

[Fire69]

SysRq kon je vroeger gebruiken om alles wat op je scherm kwam te laten printen.

Dus als je bv. c:\>Dir deed, drukte hij alles gewoon naar de printer.

[Aham brahmasmi]

Je bedoelt gewoon Prt Sc (Print Screen). Sys Rq bereik je met ctrl+Prt Sc (net als ctrl+Break).

[Chemist]

Scroll lock werkt ook in excel ; probeer maar eens ...

[Trek Y11]

Gevonden via Google:


The "Sys Rq" key stands for System Request, and its presence is
partly historical: when 286s (or otherwise known as IBM PC/AT - Advanced
Technology) first came out in 1984, a new operating system known as OS/2
came out with it to take advantage of the new 286 processor's 16MB
addressability. (This refers to the fact that it will recongise a maximum
of 16MB RAM --- despite that no-machine would be able to support that in
1984 --- it would have cost $50000 or more!) OS/2 was a joint-effort
between Microsoft and IBM to replace the CP/M type "DOS" command-line
operating system. For a system with icons, menus, etc, IBM decided that
it was a good idea to have one key the user can press to bring up a menu
with all the basic system functions (such as copying files) so they added
the key, and the keyboard swelled from 84-key XT (with function keys at
the side of the keyboard F1-F10) to the 101-key AT (with function keys at
the TOP of the keyboard F1-F12). Unfortunately for IBM, OS/2 did not
really take off and since Sys Rq has no function in DOS none of
Microsoft's literature mention the key. Funny enough, Microsoft being as
slow as usual, only realised that they needed such a key in 1995 with the
introduction of the new "Windows" key in Windows 95. Instead of Gates
admitting that IBM had forseen it 11 years ago he chose to introduce a
new key, so that people can pay for a new Microsoft Natural keyboard
instead of just using the key that everyone has.

[dion_b]

TrekY11 schreef op 07 November 2002 @ 22:45:
Gevonden via Google:


The "Sys Rq" key stands for System Request, and its presence is
partly historical: when 286s (or otherwise known as IBM PC/AT - Advanced
Technology) first came out in 1984, a new operating system known as OS/2
came out with it to take advantage of the new 286 processor's 16MB
addressability. (This refers to the fact that it will recongise a maximum
of 16MB RAM --- despite that no-machine would be able to support that in
1984 --- it would have cost $50000 or more!) OS/2 was a joint-effort
between Microsoft and IBM to replace the CP/M type "DOS" command-line
operating system. For a system with icons, menus, etc, IBM decided that
it was a good idea to have one key the user can press to bring up a menu
with all the basic system functions (such as copying files) so they added
the key, and the keyboard swelled from 84-key XT (with function keys at
the side of the keyboard F1-F10) to the 101-key AT (with function keys at
the TOP of the keyboard F1-F12). Unfortunately for IBM, OS/2 did not
really take off and since Sys Rq has no function in DOS none of
Microsoft's literature mention the key. Funny enough, Microsoft being as
slow as usual, only realised that they needed such a key in 1995 with the
introduction of the new "Windows" key in Windows 95. Instead of Gates
admitting that IBM had forseen it 11 years ago he chose to introduce a
new key, so that people can pay for a new Microsoft Natural keyboard
instead of just using the key that everyone has.

Helaas klopt er weinig van dat verhaal- een paar tegenquotes:

The first version of OS/2 was released in December 1987.

http://pages.prodigy.net/michaln/history/os210/index.html

Hilarische interview op de MS site:

ANDY GROVE: Well, I can shed possibly a thin beam of light on that. Because the PS/2 machines were slated to be built around an internally developed CMOS 286 developed inside IBM, manufactured inside IBM, under license by Intel, and we were thanked for our services and bid an affectionate goodbye.

BILL GATES: Same here.

(Laughter.)

BILL GATES: That was the machine that had this special hypervisor in it that subsumed DOS. And that's where the SysRq key on the AT machine is, because they had bonded out the 286 to use the special debug instructions. So it was an attempt to regain the high ground.

http://www.microsoft.com/...vents/pc20/08-08panel.asp

Oftewel die toets is er omdat IBM een eigen CPU met eigen instructies wilde gebruiken en de toets zou een Debug tool worden...