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+
+Dos on the fly CD image replacement is not Working with DOS
+
+Im not able to exchange CD image on the fly (needed for some games). I messed with command like - in console(ATL+CRTL+2) eject ide1-cd0 and change ide-cd0 D:/Games/!Emulators/Dos-QEMU/ISOs/TestChangeISO.iso , but system so never able to find new CD data.. simply drive so empty.. but when i reboot virtual machine, new change image is now working.
+
+  Qemu 4.2.
+
+Does this work with other guests, like Windows 95/98 as far as you can tell? Is it only a problem in DOS? What exact version of DOS are you seeing the problem with?
+
+I tried Win98 virtual machine here its working fine, without reboot.
+
+ Im using MS-DOS 7.1 - integrated within and Win9x and classic MSDEX or SHSUCDX drivers for CD-ROM, but o dpmt thing that it matters.
+
+I think I need a bit more detail, I'm sorry. Can you explain to me the full environment you are seeing the problem in?
+
+Host: Windows? Linux? what version? If Linux, what kernel version?
+Guest: what's the version of the guest you are running? Windows98, or a version of DOS directly?
+Command-line: What's the QEMU command line you used? An exact command line helps.
+
+If it works OK in Windows98 but you are using a version of DOS embedded in Windows98, can you describe exactly the circumstance in which you are seeing stale CDROM data, with steps on how to reproduce?
+
+When it "doesn't work", can you explain the exact behavior you are seeing, in which application(s)?
+
+
+
+Host: I tried both Windows (10 64bit 19.09) and Linux host (Mint 19.3 64bit, kernel 5.40) system it really doesnt matters.
+
+Guest: Windows 98 - has integrated MS-DOS 7.1 you can boot into it through boot menu, which could be set by meditation of MSDOS.SYS, but you can install MS-DOS 7.1 Standalone too, without Windows, its the same.
+ https://winworldpc.com/product/ms-dos/7x
+ What DOS is after set up through Autoexec.bat and config.sys files. 
+ Using DOS 7.1 make sense, because its most modern and supporting FAT32 file system.
+
+ There is Qemu starting line i doubt that it will help, you can simulate problem with any DOS machine.
+qemu-system-i386.exe ^
+-m 64 ^
+-hda HDDs\MS-DOS-Systen-5G.vmdk ^
+-hdb HDDs\DosData20G.vmdk ^
+-vga cirrus ^ 
+-soundhw sb16,adlib,pcspk ^
+-net nic,model=rtl8139 ^
+-net tap,ifname=TAP ^
+-cdrom Isos\dos71cd.iso ^
+-k en-us
+
+ With Windows 98 - i run just commands in monitor.. open my computer and open cd drive - content of cd is changed.. its the same as in all later OSes XP- to Win10. Its working as expected.
+
+ DOS - i boot into dos with cd drive driver enabled (lest say MSCDEX).. i run monitor, change cd image.. a trying to access it lets say that is drive E.. So i write "E:" <ENTER> to command line. I get error that drive is not accessible.. (command line should be switched to E:\ and here i should be able use "dir" to get list of files) but when i reboot machine, i see new exchange cd content.. so its at least somehow working.
+  Problem is that some games and programs require change cd on the fly, so reboot is not solution.
+  
+   You can simulate right behavior with Vmware or Virtualbox machine.
+
+   Is you are not familar with MS-DOS, here are command to autoexec and config for enable use of cd-rom drive:
+https://superuser.com/questions/778716/install-a-cd-rom-driver-on-ms-dos
+
+  Problem is probably that present version of cd exchange simulation code is not good enough / compatible for MSCDEX or SHSUCDX DOS CD-ROM drivers.. to make same action as is exchange cd on physical computer.
+
+  Windows 98 and later are using other drivers for it of course..
+
+[Expired for QEMU because there has been no activity for 60 days.]
+
+Its not incomplete. i gave lots of info.
+
+You need to reset the state from Incomplete to New after you've provided the information.
+
+
+This is an automated cleanup. This bug report has been moved to QEMU's
+new bug tracker on gitlab.com and thus gets marked as 'expired' now.
+Please continue with the discussion here:
+
+ https://gitlab.com/qemu-project/qemu/-/issues/206
+
+