graphic: 0.916
performance: 0.802
user-level: 0.790
device: 0.783
boot: 0.726
ppc: 0.687
semantic: 0.684
PID: 0.674
architecture: 0.666
socket: 0.663
debug: 0.652
mistranslation: 0.640
peripherals: 0.638
register: 0.634
files: 0.629
i386: 0.622
vnc: 0.580
network: 0.561
permissions: 0.557
x86: 0.488
kernel: 0.442
TCG: 0.438
arm: 0.424
VMM: 0.414
hypervisor: 0.396
virtual: 0.377
risc-v: 0.345
assembly: 0.282
KVM: 0.067

command.com on win95 throws video mode out

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



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.

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

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