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Scrolling doesn't work in Bochs
Posted: Sat Dec 06, 2008 12:30 am
by leledumbo
I'd like to ask this a long time ago, but I always forgot since I prefer using QEMU. My screen scrolling code works fine under QEMU but not under Bochs. Here's my bxrc file:
Code: Select all
###############################################################
# bochsrc.bxrc file for FPOS cdrom image.
###############################################################
megs: 128
romimage: file=C:\Bochs\BIOS-bochs-latest
vgaromimage: file=C:\Bochs\VGABIOS-lgpl-latest
ata0-master: type=cdrom, path="fpos.iso"
boot: cdrom
log: fpos.log
mouse: enabled=0
clock: sync=realtime
cpu: ips=500000
Do I miss some options or something? The code is taken from Bran's Kernel Development Tutorial.
Re: Scrolling doesn't work in Bochs
Posted: Sat Dec 06, 2008 12:48 am
by jzgriffin
Could we see your scrolling code?
Re: Scrolling doesn't work in Bochs
Posted: Sun Dec 07, 2008 10:39 am
by Combuster
Bochs' VGA emulation is minimalistic and it wouldn't amaze me if the register was unimplemented.
Re: Scrolling doesn't work in Bochs
Posted: Sun Dec 07, 2008 11:39 am
by stlw
cpu: ips=500000
BTW, you have very nice IPS settings. This might be correct one only if you emulating 8 wide SMP system or running emulator on some kind of old good 486 computer.
Normal settings for any modern host should at least 25x of this value, when Core 2 Duo 2667 Mhz has 75x of this value.
BTW, IPS affects everything in the emulation, even might affect your scrolling as well
Stanislav