mds7958@ritcv.UUCP (Mark Sicignano) (04/01/88)
I think the version of command.com that Leading Edge uses is different
than the normal version, because when I went to apply the patches for
echo off as the default, I could not locate the right values at the
offsets given.
when I boot up I get this message:
MS-DOS version 3.10 (C)Copyright 1981, 1985 Microsoft Corp.
and command.com tells me this:
Command v. 3.10 (C)Copyright Microsoft Corp 1981, 1985
This is the listing in the directory:
COMMAND COM 22677 5-15-85 12:00a
Would anybody have patches for my version?
Thanks,
-mark
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{rochester | ihnp4!tropix}!ritcv!mds7958
(716) 359-4050grandi@noao.arizona.edu (Steve Grandi) (04/02/88)
In article <325@ritcv.UUCP> mds7958@ritcv.UUCP (Mark Sicignano) writes: >I think the version of command.com that Leading Edge uses is different >than the normal version, because when I went to apply the patches for >echo off as the default, I could not locate the right values at the >offsets given. What you need to do to make the default behavior for batch files to be echo off is to find the following section of code in your command.com and patch the byte that occurs at the location that corresponds to 1B2C in this listing from 01 to 00. 4AE7:1B20 06 PUSH ES 4AE7:1B21 E8461A CALL 356A 4AE7:1B24 E86AFF CALL 1A91 4AE7:1B27 26 ES: 4AE7:1B28 A0FC0A MOV AL,[0AFC] 4AE7:1B2B 2401 AND AL,01 4AE7:1B2D 50 PUSH AX 4AE7:1B2E E89600 CALL 1BC7 4AE7:1B31 BE7B3D MOV SI,3D7B 4AE7:1B34 E88E15 CALL 30C5 4AE7:1B37 8BD9 MOV BX,CX 4AE7:1B39 81C3B800 ADD BX,00B8 4AE7:1B3D 51 PUSH CX 4AE7:1B3E B104 MOV CL,04 So fire up debug on a copy of command.com and search for the hex string 81C3B800 (corresponding to the the ADD BX,00B8 command). A debug command to do the deed might be "SCS:100 2000 81 C3 B8 00". A value of 1AC9 might be returned. Then do "U 1AB0" which should reproduce the above listing, and patch location 1ABC. In the 3 or 4 versions of MS-DOS 3.x that I have patched, I have had no problem locating the proper location. Unfortunately, I have not seen the "context" for the echo off patch for autoexec.bat. Could anyone who has successfully patched location 115E in a "stock" PC-DOS 3.2 to 2 to turn off echoing in autoexec.bat please post the results of a "U 114C" command in debug? -- Steve Grandi, National Optical Astronomy Observatories, Tucson AZ, 602-325-9228 UUCP: {arizona,decvax,hao,ihnp4}!noao!grandi or uunet!noao.arizona.edu!grandi Internet: grandi@noao.arizona.edu SPAN/HEPNET: 5356::GRANDI or DRACO::GRANDI