command.com on win95 throws video mode out

[John Comeau]

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

[John Comeau (jc-w)]

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.

[Thomas Huth (th-huth)]

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

[Launchpad Janitor (janitor)]

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