Download Io.sys

It is definately possible to trim it down bigtime, the io.sys I use on my boot floppy is only 74kb. I did cheat a bit with that since my starting point was a io.sys which already had the logo removed.

How do you get it that small? I can't share the full details since I was trusted with a tool called IOPAK by its author on the promise I would not share it (He did not want people to spread things like LZDOS where people distribute this as some kind of free dos clone as the LZDOS author made it seem, while in reality its just a compressed io.sys file).

Download Io.sys

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We took fundamentally different approaches then since for me the sport was trying to compress everything down enough so it would fit. Technically you could of course just use my io.sys but I understand this is out of scope for your project and you want the actual knowledge of how its done rather than the end result for your floppy.

I normally do not use my own modified io.sys on Windows 98 because I have no need to and prefer to be able to install updates. I just let Windows 98 use its own one, reserving my io.sys for a seperate fat16 dos partition where I have Windows 3.1 and of course the floppy itself.

I think I did not make myself clear. UMBPCI.SYS is OK and a very good choice of using UMBs. The problem is not for UMBs. The WinME IO.SYS has a built-in XMS driver, which prevents loading of any other open source XMS driver alternatives, like HIMEMX.EXE or HIMEMSX.EXE. This built-in XMS driver also has an evil INT15H AH=87H handler, which hangs the system if you try to load EMM386.EXE in your config.sys. Without EMM386.EXE, Win311 can not be run in 386 enhanced mode, as there is no GEMMIS API provider. The open source alternatives like JEMM386 does not have GEMMIS API. Leaving that the only hope of running win311 386enh mode under winme real mode is to use qemm386 / 386max, which are both buggy, outdated and unstable. Therefore, I asked is there a way to disable the built-in XMS driver in winme io.sys, so that loading emm386.exe may be possible.

my very short and basic question is how boot sector gets written in the first sector of disk. I mean who is responsible for it. The next question is why io.sys and msdo.sys are 11 characters long with no dot (".") sign in between them.

However, in later MS-DOS versions, the "sys" tool (copying io.sys and msdos.sys to the disk) wrote the boot sector to the floppy disk anyway to ensure that the correct boot sector is installed; in some earlier MS-DOS versions the "sys" tool seemed to rely on the fact that the disk already contained a correct boot sector.

Io.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc.The free file information forum can help you determine if io.sys is a Windows system file or if it belongs to an application that you can trust.

Description: Io.sys is not essential for the Windows OS and causes relatively few problems. The file io.sys is located in the C:\Windows\System32\drivers folder.The file size on Windows 10/11/7 is 5,152 bytes.

The driver can be started or stopped from Services in the Control Panel or by other programs.The program has no file description. The program is not visible. The service has no detailed description. It is not a Windows system file.io.sys appears to be a compressed file.Therefore the technical security rating is 52% dangerous, but you should also take into account the user reviews.

Important: Some malware disguises itself as io.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the io.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.

To help you analyze the io.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

At the very least you need command.com, io.sys and msdos.sys. The character set (codepage), keyboard layout and display localization support files can all be omitted if they're not required. Delete everything else other than those three and try, or else use a DOS/FreeDOS USB stick (created using something like Rufus) if the PC can boot from it. 2351a5e196