Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!rutgers!cmcl2!adm!news
From: C0361@univscvm.csd.scarolina.edu ( Thomas Jenkins)
Newsgroups: comp.lang.pascal
Subject: INT 019h question
Message-ID: <25207@adm.brl.mil>
Date: 6 Dec 90 16:11:16 GMT
Sender: news@adm.brl.mil
Lines: 67

Hello,

  I have a question which I'm directing to several lists.  I've gotten a
request from a section here that deals with PCs.  They are updating the config
.sys file on pcs, then rebooting.  They wanted to have the program reboot the
system after changes are complete.  When asked, I said call int 019h.  This
will preform a warm boot.  Didn't work.  All my references say 19h has no
arguments and if a certain memory location contains 1234h, no memory check
is done, else a memory check will occur.
  Now I tried it.  No luck.  These are my attempts:

Turbo Pascal 5.5 :


USES DOS;
VAR  REGS : REGISTERS ;
BEGIN
  Intr ( $19 , REGS ) ;
END.

Out come:  Starts reboot, never clears screen or starts autoexec.bat.  System
hangs.

Turbo Assembler:

MODEL IDEAL
.......

START:
         mov         ax,@DATA
         mov         ds,ax

         int         019h

         mov         al,00h
         mov         ah,04ch
         int         021h


ENDS     CODE
         END         START

( some code deletion - relavant stuff here )

Out come:  Same as above.

Now I'm really comfused!  So,  I look in my handy _Mastering_Turbo_Assembler_
by Tom Swan:  Sure enough there's a rebooting module.  The code uses the
BIOSData segment to load the 1234h and then uses a JMP FAR to the reboot
code!!!

Here's my question:  WHY?!?!?!?  Why wont int19h do as written?  I have
already written the short ( 585 byte ) exe file for them, but I'm still
confussed as to why it was done this way.  Any ideas are welcomed.  Respond
tom me or any of these lists as I read them all.

Thanks,

tom

THOMAS E. JENKINS, JR.                +--------+  FROM SHOE  +--------+
                                      |"IS THE COMPUTER STILL GIVING  |
PROGRAMMER,                           | YOU TROUBLE?..."              |
  UNIVERSITY OF SOUTH CAROLINA        |"NO, NOT ANYMORE..."           |
  C0361 AT UNIVSCVM.BITNET            |"WHAT DID YOU DO?..."          |
  C0361 AT UNIVSCVM.CSD.SCAROLINA.EDU |" I TURNED IT OFF."            |
                                      +-------------------------------+


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