jhall@wpi.WPI.EDU (John Clinton Hall) (11/28/90)
How do I perform a system warm boot? I have tried INT 19h, which is supposed to initiate the boot sequence, but it doesn't work? -- ---------------------------------------------------------------------------- The highest sounds are hardest to hear. ## ## ## ##### ## Going forward is a way to retreat. ## ## ## ## ## ## jhall Great talent shows itself late in life. ## ## ## ##### ## @wpi.wpi.edu
valley@uchicago (Doug Dougherty) (11/28/90)
jhall@wpi.WPI.EDU (John Clinton Hall) writes: >How do I perform a system warm boot? I have tried INT 19h, which is supposed >to initiate the boot sequence, but it doesn't work? >-- >---------------------------------------------------------------------------- >The highest sounds are hardest to hear. ## ## ## ##### ## >Going forward is a way to retreat. ## ## ## ## ## ## jhall >Great talent shows itself late in life. ## ## ## ##### ## @wpi.wpi.edu This oughta give you the idea: C> debug reboot.com -u 2A05:0100 A08000 MOV AL,[0080] 2A05:0103 08C0 OR AL,AL 2A05:0105 750B JNZ 0112 2A05:0107 B84000 MOV AX,0040 2A05:010A 8ED8 MOV DS,AX 2A05:010C B83412 MOV AX,1234 2A05:010F A37200 MOV [0072],AX 2A05:0112 EA0000FFFF JMP FFFF:0000 -q
ts@uwasa.fi (Timo Salmi) (11/28/90)
In article <1990Nov27.201109.1507@wpi.WPI.EDU> jhall@wpi.WPI.EDU (John Clinton Hall) writes: > >How do I perform a system warm boot? I have tried INT 19h, which is supposed >to initiate the boot sequence, but it doesn't work? You are right, I does not work, not at least consistently. You did not say what language you are using. If you use Turbo Pascal the working code is ready preprogrammed in the /pc/ts/tspas22.arc Turbo Pascal units collection available by anonymous ftp or mail server from uwasa.fi. ................................................................... Prof. Timo Salmi (Moderating at anon. ftp site 128.214.12.3) School of Business Studies, University of Vaasa, SF-65101, Finland Internet: ts@chyde.uwasa.fi Funet: gado::salmi Bitnet: salmi@finfun
rudrak@cl.bull.fr (11/28/90)
In article <1990Nov27.201109.1507@wpi.WPI.EDU> jhall@wpi.WPI.EDU (John Clinton Hall) writes: > >How do I perform a system warm boot? I have tried INT 19h, which is supposed >to initiate the boot sequence, but it doesn't work? >-- Try this: Write 1234H at address 0:472H and jump to address FFFF:0000 -- R. Purushotham Email: rudrak@saphir.cl.bull.fr F7 1 D5 BULL SA Tel Off: 34627000 ext 3928 78340 Les Clayes sous Bois FRANCE Tel Res: 34604752 =======================================================================
jhall@wpi.WPI.EDU (John Clinton Hall) (11/30/90)
Thanks to all who responded to my message on how to perform a system warm boot. In summary, to perform a system warm boot on the IBM, put the word 1234h in location 0040h:0072h and JMP to location 0FFFFh:0000h. For example, the following Debug code performs a warm boot: MOV AX,0040 MOV DS,AX MOV AX,1234 MOV [0072],AX JMP FFFF:0000 To cold boot the computer, just JMP 0FFFF:0000h. -- The highest sounds are hardest to hear. ## ## ## ##### ## jhall@wpi.wpi.edu Going forward is a way to retreat. ## ## ## ## ## ## Worcester Great talent shows itself late in life. ## ## ## ##### ## Polytechnic Even a perfect program still has bugs. ######## ## ## Institute
valley@uchicago (Doug Dougherty) (12/01/90)
jhall@wpi.WPI.EDU (John Clinton Hall) writes: >Thanks to all who responded to my message on how to perform a system warm boot. >In summary, to perform a system warm boot on the IBM, put the word 1234h in >location 0040h:0072h and JMP to location 0FFFFh:0000h. For example, the >following Debug code performs a warm boot: > MOV AX,0040 > MOV DS,AX > MOV AX,1234 > MOV [0072],AX > JMP FFFF:0000 >To cold boot the computer, just JMP 0FFFF:0000h. >-- >The highest sounds are hardest to hear. ## ## ## ##### ## jhall@wpi.wpi.edu >Going forward is a way to retreat. ## ## ## ## ## ## Worcester >Great talent shows itself late in life. ## ## ## ##### ## Polytechnic >Even a perfect program still has bugs. ######## ## ## Institute There are, in fact, some other "magic numbers" one can put into that location and have strange, magical, and mystical things happen. Unfortunately, I don't any of them. Incidentally, the boot code does ensure that there is a value other than 1234 in that location, so you shouldn't ever have to manually set it to ensure a cold boot.
david@csource.oz.au (david nugent) (12/06/90)
In <1990Nov30.154658.16398@wpi.WPI.EDU> jhall@wpi.WPI.EDU (John Clinton Hall) writes: > In summary, to perform a system warm boot on the IBM, put the word 1234h in > location 0040h:0072h and JMP to location 0FFFFh:0000h. For example, the > following Debug code performs a warm boot: > MOV AX,0040 > MOV DS,AX > MOV AX,1234 > MOV [0072],AX > JMP FFFF:0000 > To cold boot the computer, just JMP 0FFFF:0000h. ... which doesn't work reliably - if at all - on a 386 running any sort of memory management. It also won't work reliably under DESQview, and will definitely hang both PC-MOS/386 and Windows 3.x. I'm glad to say, it does work just fine under VP/ix though. :-) -- Fidonet: 3:632/348 SIGnet: 28:4100/1 Imex: 90:833/387 Data: +61-3-885-7864 Voice: +61-3-826-6711 Internet/ACSnet: david@csource.oz.au Uucp: ..!uunet!munnari!csource!david