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DOS: cold boot / warm boot

haglebu

Experienced Member
Joined
Nov 22, 2018
Messages
119
Location
Germany, Lower-Saxony, Hildesheim
One should actually think that the key combination CTRL+ALT+DEL triggers a warm start. On all my DOS computers it's so; it always was, but ... However, I have an IBM PC 5150 motherboard where this is not the case. The key combination always triggers a cold start! Also a mini program created with DEBUG, which should trigger a warm boot, creates only a cold start. Does anyone have an idea why?
 

Stone

10k Member
Joined
Nov 3, 2009
Messages
12,814
Location
South Jersey, USA
Also a mini program created with DEBUG, which should trigger a warm boot, creates only a cold start. Does anyone have an idea why?
I use this one:


goto begin

e 40:72 34 12
rcs
ffff
rip
0000
g

:begin
debug<c:\reboot.bat


See what that does.

I also have a 16 byte com file (reboot.com) that does the same thing if you'd like to try that one.
 

haglebu

Experienced Member
Joined
Nov 22, 2018
Messages
119
Location
Germany, Lower-Saxony, Hildesheim
I tested your batch file. But it also only triggers a cold start. It would also have surprised me, because your DEBUG instructions correspond to mine. The following code is from Scott Mueller (URP, 2nd Ed., p. 828):
Code:
DEBUG
-N WARMBOOT.COM
-A 100
MOV AX,0040
MOV DS,AX
MOV WORD PTR [0072],1234
JMP FFFF:0

-R CX
10
-W
-Q

I use WARMBOOT.COM on all my PC's and it works otherwise perfectly.
 
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