[Bug 1873338] Re: Dos on the fly CD image replacement is not Working with DOS

[ruthan]

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..

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https://bugs.launchpad.net/bugs/1873338

Title:
  Dos on the fly CD image replacement is not Working with DOS

Status in QEMU:
  Incomplete

Bug description:
  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.

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