Hardware Reference
In-Depth Information
It is important to note that a newline, i.e.
<ENTER>
, should be used to terminate
each line and the input should be terminated (after the newline which follows
"
Q
") by means of
<CTRL-Z>
(shown as
ˆZ
). The
<CTRL-Z>
should also be
followed by a newline.
The keystrokes will generate a file (WARM.DBG) which can be used as input
to Debug by means of the following command:
DEBUG < WARM.DBG
Debug will assemble the statements contained in the script file in order to gen-
erate an executable file, WARM.COM. This program can be executed directly
from the DOS prompt by typing WARM followed by enter (Note: this will
reboot your system!).
Cold reboot
If a cold reboot is required, the assembly code should be modified by changing
the
MOV AX,1234
to
MOV AX,0
. The following keyboard entries are required:
COPY CON COLD.DBG
A
XOR AX,AX
MOV ES,AX
MOV DI,0472
MOV AX,0
STOSW
JMP FFFF:0000
NCOLD.COM
RCX
10
W
Q
ˆZ
Again, note that the input should be terminated (after the Enter that follows
"
Q
") by means of
<CTRL-Z>
(shown as
ˆZ
) which is also followed by Enter.
The keystrokes will generate a file (COLD.DBG) which can be used as input
to Debug by means of the following command:
DEBUG < COLD.DBG
Debug will assemble the statements contained in the script file in order to
generate an executable file, COLD.COM. This program can be executed directly
from the DOS prompt by typing
COLD
followed by enter. This should again
reboot your system but this time the initial memory check routines will be
performed.
