Original from  mark lewis  to Mike Ruskai on 12-25-1998
Original Subject: Guess who's back... ;)

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  IT>> cli
  IT>> x:
  IT>> jmp x
 
  IT>> Execute this in a DOS window.
 
  IT>> Hope you closed all the applications first... ;)
 
  MR> That will only work on early-step 486's from Intel, and
  MR> non-Intel processors.
 
ml> could that be because it isn't right? as i recall, it was...
ml> 
ml>   x:
ml>   cli
ml>   jmp x

 Same things. Both are the same "problem", a disabled 
(non-interruptable) loop.

 Both will cause OS/2 to "hang" on 386 and early step 486 systems. 
Neither will cause a problem with OS/2 running on later stepping 486 
processors, Pentium (or later) processors, or systems with a watchdog 
timer on the bus (IBM PS/2 systems). 
 It will cause a hang on ALL systems running Win95, and NO systems 
running NT. NT uses a different (slower) technique to emulate the VDM 
CLI instruction, Win95 doesn't use any "protection" at all. Neither 
exploits the watchdog timer or the hardware capability in the Pentium 
or later stepping level 486 processors to circumvent this. 



   Denis       

 All opinions are my very own, IBM has no claim upon them
. 
. 
.
 

 




--- Maximus/2 3.01