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Well, I didn't do much. I just assigned drives in autoexec part and nothing more.

I changed to sbpro2 but still no change (tried also other settings).

Here are contents of my dosbox.conf file:

[sdl]
# fullscreen -- Start dosbox directly in fullscreen.
# fulldouble -- Use double buffering in fullscreen.
# fullresolution -- What resolution to use for fullscreen: original or fixed size (e.g. 

1024x768).
# windowresolution -- Scale the window to this size IF the output device supports hardware 

scaling.
# output -- What to use for output: surface,overlay,opengl,openglnb,ddraw.
# autolock -- Mouse will automatically lock, if you click on the screen.
# sensitiviy -- Mouse sensitivity.
# waitonerror -- Wait before closing the console if dosbox has an error.
# priority -- Priority levels for dosbox: lowest,lower,normal,higher,highest.
#************ Second entry behind the comma is for when dosbox is not focused/minimized.
# mapperfile -- File used to load/save the key/event mappings from.
# usescancodes -- Avoid usage of symkeys, might not work on all operating systems.

fullscreen=false
fulldouble=false
fullresolution=original
windowresolution=original
output=surface
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper.txt
usescancodes=true

[dosbox]
# language -- Select another language file.
# memsize -- Amount of memory dosbox has in megabytes.
# machine -- The type of machine tries to emulate:hercules,cga,tandy,pcjr,vga.
# captures -- Directory where things like wave,midi,screenshot get captured.

language=
machine=vga
captures=capture
memsize=16

[render]
# frameskip -- How many frames dosbox skips before drawing one.
# aspect -- Do aspect correction, if your output method doesn't support scaling this can slow 

things down!.
# scaler -- Scaler used to enlarge/enhance low resolution modes.
#********** Supported are 

none,normal2x,normal3x,advmame2x,advmame3x,advinterp2x,advinterp3x,tv2x,tv3x,rgb2x,rgb3x,scan2x,s

can3x.

frameskip=0
aspect=false
scaler=normal2x

[cpu]
# core -- CPU Core used in emulation: simple,normal,full,dynamic.
# cycles -- Amount of instructions dosbox tries to emulate each millisecond.
#********** Setting this higher than your machine can handle is bad!
#********** You can also let DOSBox guess the correct value by setting it to auto.
#********** Please note that this guessing feature is still experimental.
# cycleup** -- Amount of cycles to increase/decrease with keycombo.
# cycledown****Setting it lower than 100 will be a percentage.

core=normal
cycles=3000
cycleup=500
cycledown=20

[mixer]
# nosound -- Enable silent mode, sound is still emulated though.
# rate -- Mixer sample rate, setting any devices higher than this will
#******** probably lower their sound quality.
# blocksize -- Mixer block size, larger blocks might help sound stuttering
#**************but sound will also be more lagged.
# prebuffer -- How many milliseconds of data to keep on top of the blocksize.

nosound=false
rate=22050
blocksize=2048
prebuffer=10

[midi]
# mpu401******-- Type of MPU-401 to emulate: none, uart or intelligent.
# device******-- Device that will receive the MIDI data from MPU-401.
#****************This can be default,alsa,oss,win32,coreaudio,none.
# config******-- Special configuration options for the device. In Windows put
#****************the id of the device you want to use. See README for details.

mpu401=intelligent
device=default
config=

[sblaster]
# sbtype -- Type of sblaster to emulate:none,sb1,sb2,sbpro1,sbpro2,sb16.
# sbbase,irq,dma,hdma -- The IO/IRQ/DMA/High DMA address of the soundblaster.
# mixer -- Allow the soundblaster mixer to modify the dosbox mixer.
# oplmode -- Type of OPL emulation: auto,cms,opl2,dualopl2,opl3.
#************On auto the mode is determined by sblaster type.
#************All OPL modes are 'Adlib', except for CMS.
# oplrate -- Sample rate of OPL music emulation.

sbtype=sbpro2
sbbase=220
irq=7
dma=1
hdma=5
mixer=true
oplmode=auto
oplrate=22050

[gus]
# gus -- Enable the Gravis Ultrasound emulation.
# gusbase,irq1,irq2,dma1,dma2 -- The IO/IRQ/DMA addresses of the 
#************Gravis Ultrasound. (Same IRQ's and DMA's are OK.)
# gusrate -- Sample rate of Ultrasound emulation.
# ultradir -- Path to Ultrasound directory.**In this directory
#************ there should be a MIDI directory that contains
#************ the patch files for GUS playback.**Patch sets used
#************ with Timidity should work fine.

gus=true
gusrate=22050
gusbase=240
irq1=5
irq2=5
dma1=3
dma2=3
ultradir=C:\ULTRASND

[speaker]
# pcspeaker -- Enable PC-Speaker emulation.
# pcrate -- Sample rate of the PC-Speaker sound generation.
# tandy -- Enable Tandy Sound System emulation (off,on,auto).
#**********For auto Tandysound emulation is present only if machine is set to tandy.
# tandyrate -- Sample rate of the Tandy 3-Voice generation.
# disney -- Enable Disney Sound Source emulation.

pcspeaker=true
pcrate=22050
tandy=auto
tandyrate=22050
disney=true

[bios]
# joysticktype -- Type of joystick to emulate: none, 2axis, 4axis,
#**************** fcs (Thrustmaster) ,ch (CH Flightstick).
#**************** none disables joystick emulation.
#**************** 2axis is the default and supports two joysticks.

joysticktype=2axis

[serial]
# serial1-4 -- set type of device connected to com port.
#**************Can be disabled, dummy, modem, directserial.
#**************Additional parameters must be in the same line in the form of
#**************parameter:value. Parameters for all types are irq, startbps, bytesize,
#**************stopbits, parity (all optional).
#**************for directserial: realport (required).
#**************for modem: listenport (optional).
#**************Example: serial1=modem listenport:5000

serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled

[dos]
# xms -- Enable XMS support.
# ems -- Enable EMS support.
# umb -- Enable UMB support (false,true,max).

xms=true
ems=true
umb=true

[ipx]
# ipx -- Enable ipx over UDP/IP emulation.

ipx=false

[autoexec]
# Lines in this section will be run at startup.

mount C D:\DOS\CDrive
mount D E:\ -t cdrom
C:
CLS