[Qemu-devel] [Bug 1530386] [NEW] command.com on win95 throws video mode out

[Qemu-devel] [Bug 1530386] [NEW] command.com on win95 throws video mode out

[John Comeau]

Public bug reported:

on a presumed-good copy of Windows 95 obtained from http://forum.xda-
developers.com/showthread.php?t=1960870, the operating system boots
successfully and shows up fine, but as soon as I double-click the MS-DOS
icon, the window, while remaining the same size, goes to a different
resolution and only shows a small portion of what it did, with strange
colors and artifacts. tried first with the Debian 2.5 package, then with
latest cvs sources, then with the 2.5.0 release, all the same problem.

jcomeau@aspire:/usr/src/qemu-2.5.0/build$ cd /tmp/win95/SDL/
jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 c.img 
jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 --version
QEMU emulator version 2.5.0, Copyright (c) 2003-2008 Fabrice Bellard

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "qemubad.png"
   https://bugs.launchpad.net/bugs/1530386/+attachment/4542636/+files/qemubad.png

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Title:
  command.com on win95 throws video mode out

Status in QEMU:
  New

Bug description:
  on a presumed-good copy of Windows 95 obtained from http://forum.xda-
  developers.com/showthread.php?t=1960870, the operating system boots
  successfully and shows up fine, but as soon as I double-click the MS-
  DOS icon, the window, while remaining the same size, goes to a
  different resolution and only shows a small portion of what it did,
  with strange colors and artifacts. tried first with the Debian 2.5
  package, then with latest cvs sources, then with the 2.5.0 release,
  all the same problem.

  jcomeau@aspire:/usr/src/qemu-2.5.0/build$ cd /tmp/win95/SDL/
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 c.img 
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 --version
  QEMU emulator version 2.5.0, Copyright (c) 2003-2008 Fabrice Bellard

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[Qemu-devel] [Bug 1530386] Re: command.com on win95 throws video mode out

[John Comeau]

verified that the problem does not exist on bochs version 2.6-5 Debian
package. I first had to convert the image from qcow to raw: qemu-img
convert -O raw c.img c_raw.img

bxrc file:

megs: 32
vga: extension=vbe
romimage: file=$BXSHARE/BIOS-bochs-latest
vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
cpu: count=1, ips=100000000, reset_on_triple_fault=1
boot: disk
ata0-master: type=disk, path="/tmp/c_raw.img"
#info: action=report
#debug: action=report
log: /tmp/bochs-win95.log
mouse: enabled=0
vga_update_interval: 150000

command line: bochs -q -f /tmp/bochs.bxrc

screenshot attached.

** Attachment added: "screenshot of same image running under bochs"
   https://bugs.launchpad.net/qemu/+bug/1530386/+attachment/4542686/+files/screenshot.png

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Title:
  command.com on win95 throws video mode out

Status in QEMU:
  New

Bug description:
  on a presumed-good copy of Windows 95 obtained from http://forum.xda-
  developers.com/showthread.php?t=1960870, the operating system boots
  successfully and shows up fine, but as soon as I double-click the MS-
  DOS icon, the window, while remaining the same size, goes to a
  different resolution and only shows a small portion of what it did,
  with strange colors and artifacts. tried first with the Debian 2.5
  package, then with latest cvs sources, then with the 2.5.0 release,
  all the same problem.

  jcomeau@aspire:/usr/src/qemu-2.5.0/build$ cd /tmp/win95/SDL/
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 c.img 
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 --version
  QEMU emulator version 2.5.0, Copyright (c) 2003-2008 Fabrice Bellard

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[Qemu-devel] [Bug 1530386] Re: command.com on win95 throws video mode out

[Thomas Huth]

Can you still reproduce this issue with the latest version of QEMU?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1530386

Title:
  command.com on win95 throws video mode out

Status in QEMU:
  Incomplete

Bug description:
  on a presumed-good copy of Windows 95 obtained from http://forum.xda-
  developers.com/showthread.php?t=1960870, the operating system boots
  successfully and shows up fine, but as soon as I double-click the MS-
  DOS icon, the window, while remaining the same size, goes to a
  different resolution and only shows a small portion of what it did,
  with strange colors and artifacts. tried first with the Debian 2.5
  package, then with latest cvs sources, then with the 2.5.0 release,
  all the same problem.

  jcomeau@aspire:/usr/src/qemu-2.5.0/build$ cd /tmp/win95/SDL/
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 c.img 
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 --version
  QEMU emulator version 2.5.0, Copyright (c) 2003-2008 Fabrice Bellard

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[Qemu-devel] [Bug 1530386] Re: command.com on win95 throws video mode out

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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Title:
  command.com on win95 throws video mode out

Status in QEMU:
  Expired

Bug description:
  on a presumed-good copy of Windows 95 obtained from http://forum.xda-
  developers.com/showthread.php?t=1960870, the operating system boots
  successfully and shows up fine, but as soon as I double-click the MS-
  DOS icon, the window, while remaining the same size, goes to a
  different resolution and only shows a small portion of what it did,
  with strange colors and artifacts. tried first with the Debian 2.5
  package, then with latest cvs sources, then with the 2.5.0 release,
  all the same problem.

  jcomeau@aspire:/usr/src/qemu-2.5.0/build$ cd /tmp/win95/SDL/
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 c.img 
  jcomeau@aspire:/tmp/win95/SDL$ /usr/src/qemu-2.5.0/build/i386-softmmu/qemu-system-i386 --version
  QEMU emulator version 2.5.0, Copyright (c) 2003-2008 Fabrice Bellard

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