mirror of https://github.com/microsoft/MS-DOS.git
62 lines
2.4 KiB
Plaintext
62 lines
2.4 KiB
Plaintext
|
There are three locations in the DOS where OEMs may want to
|
|||
|
|
patch in information specific to their installation.
|
|||
|
|
|
|||
|
|
|
|||
|
|
The first is the location of the default switch character.
|
|||
|
|
This character is one byte at DEBUG location 1E5, and is
|
|||
|
|
set to '/'. To change it to '-' (XENIX compatible)
|
|||
|
|
do:
|
|||
|
|
|
|||
|
|
DEBUG MSDOS.SYS
|
|||
|
|
|
|||
|
|
>e1e5
|
|||
|
|
XXXX:01E5 2F. <at this point give the desired
|
|||
|
|
new switch character in HEX and
|
|||
|
|
hit return>
|
|||
|
|
>w
|
|||
|
|
Writing YYYY Bytes
|
|||
|
|
>q
|
|||
|
|
|
|||
|
|
If the byte at 1E5 is not 2F, look around in the immediate
|
|||
|
|
vacinity (do d1e0) for it. It is the only 2F in that area.
|
|||
|
|
|
|||
|
|
|
|||
|
|
The second is the location of the 24 bit user number and the
|
|||
|
|
8 bit OEM number. These values are returned by the GET_VERSION
|
|||
|
|
system call.
|
|||
|
|
The user number is 3 bytes starting at
|
|||
|
|
debug location 683, The OEM number is one byte at debug location
|
|||
|
|
686. The user number is initialized to 0, the OEM number to -1
|
|||
|
|
and they immediatly follow the Microsoft Copyright message. If these
|
|||
|
|
bytes are not zero, look for the four bytes following the
|
|||
|
|
Copyright message which should be in the vacinity of 683.
|
|||
|
|
OEMs should request an OEM number from Microsoft if they
|
|||
|
|
want one of their very own, this prevents selecting one someone
|
|||
|
|
else already has.
|
|||
|
|
|
|||
|
|
|
|||
|
|
The third is the location of the editing template definitions.
|
|||
|
|
This is a table which defines the two byte edit function keys
|
|||
|
|
for system call 10 and for EDLIN. This table is at debug location
|
|||
|
|
33EA, and should start with a 1B. If the byte at 33EA is not
|
|||
|
|
1B, look around in the immediate vacinity. Here is what the
|
|||
|
|
default table looks like. It is a definition for the Zenith
|
|||
|
|
Z-19 terminal:
|
|||
|
|
|
|||
|
|
ESCCHAR DB 1BH ;The Escape character, Nul (0) on IBM
|
|||
|
|
ESCTAB:
|
|||
|
|
DB "Z" ;5AH Put a ^Z in the template, F6 on IBM
|
|||
|
|
DB "S" ;53H Copy one char, --> on IBM
|
|||
|
|
DB "V" ;56H Skip one char, DEL on IBM
|
|||
|
|
DB "T" ;54H Copy to char, F2 on IBM
|
|||
|
|
DB "W" ;57H Skip to char, F4 on IBM
|
|||
|
|
DB "U" ;55H Copy line, F3 on IBM
|
|||
|
|
DB "E" ;45H Kill line, Not used on IBM
|
|||
|
|
DB "J" ;4AH Reedit line, F5 on IBM
|
|||
|
|
DB "D" ;44H Backspace, <-- on IBM
|
|||
|
|
DB "P" ;50H Toggle insert mode, INS on IBM
|
|||
|
|
DB "Q" ;51H Toggle insert mode, INS on IBM
|
|||
|
|
DB "R" ;52H Escape char, F7 on IBM
|
|||
|
|
DB "R" ;52H End of table, must be same as previos character
|
|||
|
|
|
|||
|
|
|