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Maximus Decim Cumulative Update ver.2.10


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"DOS driveletter fix" is a patch for any io.sys which makes DOS to forget drive letter order when installing new drive.

Does anybody know any details regarding this fix? Is there any webpage with dscription? Is the author known?

Is this the fix that was present in older versions of SESP?

It means

change from

81,FF,00,04,73,06,BE,04,00,E9,E7,FD,50,32,C0,86,06,5C,0F,0A,C0,58,74,EE,80,0E

to:

81,FF,00,03,73,06,BE,04,00,E9,E7,FD,50,32,C0,86,06,5C,0F,0A,C0,58,90,90,80,0E

or in assembler form:

MOV SI,4 -> MOV SI,3

.....

JZ $-10 -> NOP, NOP

What it exactly does?

Petr

Edited by Petr
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The only "unofficial" IO.SYS patches I know of are these 2 [not counting the WinME IO.SYS real DOS mode patches]:

* IO Patch v1.4 16-bit for Windows 95B/95C OSR 2.x and 98/98 SE patches

Microsoft IO.SYS to allow using it on creating bootable CD-ROM/floppy images

[37 KB, freeware]:

http://www.funet.fi/pub/simtelnet/msdos/cdrom/iopat14.zip

* JO.SYS v1.4 16-bit for Windows 98/98 SE patches Microsoft IO.SYS to allow

proper delay/schedule when booting from bootable CD-ROMs/floppies:

http://www.nu2.nu/jo/

Direct download [25 KB, freeware]:

http://www.nu2.nu/download.php?sFile=jo14.zip

Bootable Windows 98/98 SE floppy Boot Sector Fix [16 KB, free]:

http://www.nu2.nu/download.php?sFile=w98btfix.zip

Hope this helps.

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Does anybody know any details regarding this fix? Is there any webpage with dscription? Is the author known?

Is this the fix that was present in older versions of SESP?

I have found this patch in the russian conferences FIDO three years ago. The patch has been named well-known, without the instruction of the author. I searched for other similar patch, but have not found anywhere. I have written only the program carrying out correction. It works with any version IO.SYS (original, Q239697, Q311561) Windows 98se. Will probably work c as the file IO.SYS Windows 98 FE.

Comparing files io.old and io.sys

000016A4: FE E8

000016A5: C2 EF

000016A6: FE 08

000016A7: CE FE

000016A8: 75 C2

000016A9: E1 FE

000016AA: E8 CE

000016AB: DE 75

000016AC: 08 DE

00001FC1: FE C3

I use this patch without problems three years by many machines.

There are some problems at display of the information fdisk (and free fdisk) -are changed by places of the letter of disks.

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I have found this patch in the russian conferences FIDO three years ago. The patch has been named well-known, without the instruction of the author.

I use this patch without problems three years by many machines.

There are some problems at display of the information fdisk (and free fdisk) -are changed by places of the letter of disks.

And do you know what does this patch? In your readme is written: "patch IO.SYS for change of the order of assignment of letters to hard disks" - but what change?

Anyway, it seems there are more patches:

1. This "Patch IO.SYS from Windiws 98SE for change about layout of disks v1.1"

000016A4: FE E8

000016A5: C2 EF

000016A6: FE 08

000016A7: CE FE

000016A8: 75 C2

000016A9: E1 FE

000016AA: E8 CE

000016AB: DE 75

000016AC: 08 DE

00001FC1: FE C3

2. Patch used long time in SESP, also Tihiy's IO.SYS with logo removed is patched this way. Unknown function.

000136C2: 04 03

000136D5: 74 90

000136D6: EE 90

3. IOPATCH v1.4, ©1999 by Gary Tong, g.t@mailcity.com

(mentioned by MDGx above):

0000AD48: 8A F5

0000AD49: 00 FF

0000E5AB: B4 90

0000E5AC: 4B E8

0000E5AD: CD 83

0000E5AE: 21 29

00010AC0: "Starting Windows 98" changed to "FAT32 CD-ROM Boot... "

00010FA2: 20 0D

00010FA3: 20 0A

00010FA4: CD 24

00010FA5: CD 00

00010FA6: CD B4

00010FA7: CD 4B

00010FA8: CD 52

00010FA9: CD 50

00010FAB: CD 21

00010FAC: CD 58

00010FAD: CD 5A

00010FAE: CD 72

00010FAF: CD F8

00010FB0: CD C3

So there are three different patches, the third for CD-ROMs only, the first almost undocumented but at least we know that it changes drive letters by some way.

The second patch, that had been in SESP v 1.2 to 2.0rc2 is mysterious - nobody knows what it does.

Petr

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