# You may now use double quotes around pathnames, in case
# your pathname includes spaces.

#=======================================================================
# CONFIG_INTERFACE
#
# The configuration interface is a series of menus or dialog boxes that
# allows you to change all the settings that control Bochs's behavior.
# There are two choices of configuration interface: a text mode version
# called "textconfig" and a graphical version called "wx".  The text
# mode version uses stdin/stdout and is always compiled in.  The graphical
# version is only available when you use "--with-wx" on the configure 
# command.  If you do not write a config_interface line, Bochs will 
# choose a default for you.
#
# NOTE: if you use the "wx" configuration interface, you must also use
# the "wx" display library.
#=======================================================================
#config_interface: textconfig
#config_interface: wx

#=======================================================================
# DISPLAY_LIBRARY
#
# The display library is the code that displays the Bochs VGA screen.  Bochs 
# has a selection of about 10 different display library implementations for 
# different platforms.  If you run configure with multiple --with-* options, 
# the display_library command lets you choose which one you want to run with.
# If you do not write a display_library line, Bochs will choose a default for
# you.
#
# The choices are: 
#   x              use X windows interface, cross platform
#   win32          use native win32 libraries
#   carbon         use Carbon library (for MacOS X)
#   beos           use native BeOS libraries
#   macintosh      use MacOS pre-10
#   amigaos        use native AmigaOS libraries
#   sdl            use SDL library, cross platform
#   svga           use SVGALIB library for Linux, allows graphics without X11
#   term           text only, uses curses/ncurses library, cross platform
#   rfb            provides an interface to AT&T's VNC viewer, cross platform
#   wx             use wxWidgets library, cross platform
#   nogui          no display at all
#
# NOTE: if you use the "wx" configuration interface, you must also use
# the "wx" display library.
#
# Specific options:
# Some display libraries now support specific option to control their
# behaviour. See the examples below for currently supported options.
#=======================================================================
#display_library: amigaos
#display_library: beos
#display_library: carbon
#display_library: macintosh
#display_library: nogui
#display_library: rfb, options="timeout=60" # time to wait for client
#display_library: sdl, options="fullscreen" # startup in fullscreen mode
#display_library: term
#display_library: win32, options="legacyF12" # use F12 to toggle mouse
#display_library: wx
#display_library: x

#=======================================================================
# ROMIMAGE:
# The ROM BIOS controls what the PC does when it first powers on.
# Normally, you can use a precompiled BIOS in the source or binary
# distribution called BIOS-bochs-latest. The ROM BIOS is usually loaded
# starting at address 0xf0000, and it is exactly 64k long.
# You can also use the environment variable $BXSHARE to specify the
# location of the BIOS.
# The usage of external large BIOS images (up to 512k) at memory top is
# now supported, but we still recommend to use the BIOS distributed with
# Bochs. Now the start address can be calculated from image size.
#=======================================================================
romimage: file=bochs/bios/BIOS-bochs-latest, address=0xe0000
#romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top
#romimage: file=mybios.bin # calculate start address from image size

#=======================================================================
# CPU:
# This defines cpu-related parameters inside Bochs:
#
#  COUNT:
#  Set the number of processors:cores per processor:threads per core 
#  when Bochs is compiled for SMP emulation.
#  Bochs currently supports up to 8 threads running simultaniosly. 
#  If Bochs is compiled without SMP support, it won't accept values 
#  different from 1.
#
#  RESET_ON_TRIPLE_FAULT:
#  Reset the CPU when triple fault occur (highly recommended) rather than
#  PANIC. Remember that if you trying to continue after triple fault the 
#  simulation will be completely bogus !
#
#  IPS:
#  Emulated Instructions Per Second.  This is the number of IPS that bochs
#  is capable of running on your machine. You can recompile Bochs with
#  --enable-show-ips option enabled, to find your workstation's capability.
#  Measured IPS value will then be logged into your log file or status bar
#  (if supported by the gui).
#
#  IPS is used to calibrate many time-dependent events within the bochs 
#  simulation.  For example, changing IPS affects the frequency of VGA
#  updates, the duration of time before a key starts to autorepeat, and
#  the measurement of BogoMips and other benchmarks.
#
#  Examples:
#  Machine                                         Mips
# ________________________________________________________________
#  2.1Ghz Athlon XP with Linux 2.6/g++ 3.4         12 to 15 Mips
#  1.6Ghz Intel P4 with Win2000/g++ 3.3             5 to  7 Mips
#  650Mhz Athlon K-7 with Linux 2.4.4/egcs-2.91.66  2 to  2.5 Mips
#  400Mhz Pentium II with Linux 2.0.36/egcs-1.0.3   1 to  1.8 Mips
#=======================================================================
cpu: count=1, ips=10000000, reset_on_triple_fault=1

#=======================================================================
# MEGS
# Set the number of Megabytes of physical memory you want to emulate. 
# The default is 32MB, most OS's won't need more than that.
# The maximum amount of memory supported is 2048Mb.
#=======================================================================
#megs: 256
#megs: 128
#megs: 64
megs: 32
#megs: 16
#megs: 8

#=======================================================================
# OPTROMIMAGE[1-4]:
# You may now load up to 4 optional ROM images. Be sure to use a 
# read-only area, typically between C8000 and EFFFF. These optional
# ROM images should not overwrite the rombios (located at
# F0000-FFFFF) and the videobios (located at C0000-C7FFF).
# Those ROM images will be initialized by the bios if they contain 
# the right signature (0x55AA) and a valid checksum.
# It can also be a convenient way to upload some arbitrary code/data
# in the simulation, that can be retrieved by the boot loader
#=======================================================================
#optromimage1: file=optionalrom.bin, address=0xd0000
#optromimage2: file=optionalrom.bin, address=0xd1000
#optromimage3: file=optionalrom.bin, address=0xd2000
#optromimage4: file=optionalrom.bin, address=0xd3000
optromimage1: file=../../src/bin/pnic.rom, address=0xd0000
#optromimage1: file=../../src/bin/rtl8029.rom, address=0xd0000

#optramimage1: file=/path/file1.img, address=0x0010000
#optramimage2: file=/path/file2.img, address=0x0020000
#optramimage3: file=/path/file3.img, address=0x0030000
#optramimage4: file=/path/file4.img, address=0x0040000

#=======================================================================
# VGAROMIMAGE
# You now need to load a VGA ROM BIOS into C0000.
#=======================================================================
#vgaromimage: file=bios/VGABIOS-elpin-2.40
vgaromimage: file=bochs/bios/VGABIOS-lgpl-latest
#vgaromimage: file=bios/VGABIOS-lgpl-latest-cirrus

#=======================================================================
# VGA:
# Here you can specify the display extension to be used. With the value
# 'none' you can use standard VGA with no extension. Other supported
# values are 'vbe' for Bochs VBE and 'cirrus' for Cirrus SVGA support.
#=======================================================================
#vga: extension=cirrus
#vga: extension=vbe
vga: extension=none

#=======================================================================
# FLOPPYA:
# Point this to pathname of floppy image file or device
# This should be of a bootable floppy(image/device) if you're
# booting from 'a' (or 'floppy').
#
# You can set the initial status of the media to 'ejected' or 'inserted'.
#   floppya: 2_88=path, status=ejected             (2.88M 3.5" floppy)
#   floppya: 1_44=path, status=inserted            (1.44M 3.5" floppy)
#   floppya: 1_2=path, status=ejected              (1.2M  5.25" floppy)
#   floppya: 720k=path, status=inserted            (720K  3.5" floppy)
#   floppya: 360k=path, status=inserted            (360K  5.25" floppy)
#   floppya: 320k=path, status=inserted            (320K  5.25" floppy)
#   floppya: 180k=path, status=inserted            (180K  5.25" floppy)
#   floppya: 160k=path, status=inserted            (160K  5.25" floppy)
#   floppya: image=path, status=inserted           (guess type from image size)
#
# The path should be the name of a disk image file.  On Unix, you can use a raw
# device name such as /dev/fd0 on Linux.  On win32 platforms, use drive letters
# such as a: or b: as the path.  The parameter 'image' works with image files
# only. In that case the size must match one of the supported types.
#=======================================================================
#floppya: 1_44=/dev/fd0, status=inserted
#floppya: image=../1.44, status=inserted
#floppya: 1_44=/dev/fd0H1440, status=inserted
#floppya: 1_2=../1_2, status=inserted
#floppya: 1_44=a:, status=inserted
#floppya: 1_44=a.img, status=inserted
#floppya: 1_44=/dev/rfd0a, status=inserted
floppya: 1_44=../../src/bin/pnic.dsk, status=inserted

#=======================================================================
# FLOPPYB:
# See FLOPPYA above for syntax
#=======================================================================
#floppyb: 1_44=b:, status=inserted
floppyb: 1_44=b.img, status=inserted

#=======================================================================
# ATA0, ATA1, ATA2, ATA3
# ATA controller for hard disks and cdroms
#
# ata[0-3]: enabled=[0|1], ioaddr1=addr, ioaddr2=addr, irq=number
# 
# These options enables up to 4 ata channels. For each channel
# the two base io addresses and the irq must be specified.
# 
# ata0 and ata1 are enabled by default with the values shown below
#
# Examples:
#   ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
#   ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
#   ata2: enabled=1, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
#   ata3: enabled=1, ioaddr1=0x168, ioaddr2=0x360, irq=9
#=======================================================================
ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9

#=======================================================================
# ATA[0-3]-MASTER, ATA[0-3]-SLAVE
#
# This defines the type and characteristics of all attached ata devices:
#   type=       type of attached device [disk|cdrom] 
#   mode=       only valid for disks [flat|concat|external|dll|sparse|vmware3]
#   mode=       only valid for disks [undoable|growing|volatile]
#   path=       path of the image
#   cylinders=  only valid for disks
#   heads=      only valid for disks
#   spt=        only valid for disks
#   status=     only valid for cdroms [inserted|ejected]
#   biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]
#   translation=type of translation of the bios, only for disks [none|lba|large|rechs|auto]
#   model=      string returned by identify device command
#   journal=    optional filename of the redolog for undoable and volatile disks
#   
# Point this at a hard disk image file, cdrom iso file, or physical cdrom
# device.  To create a hard disk image, try running bximage.  It will help you
# choose the size and then suggest a line that works with it.
#
# In UNIX it may be possible to use a raw device as a Bochs hard disk, 
# but WE DON'T RECOMMEND IT.  In Windows there is no easy way.
#
# In windows, the drive letter + colon notation should be used for cdroms.
# Depending on versions of windows and drivers, you may only be able to 
# access the "first" cdrom in the system.  On MacOSX, use path="drive"
# to access the physical drive.
#
# The path is always mandatory. For flat hard disk images created with
# bximage geometry autodetection can be used (cylinders=0 -> cylinders are
# calculated using heads=16 and spt=63). For other hard disk images and modes
# the cylinders, heads, and spt are mandatory.
#
# Default values are:
#   mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"
#
# The biosdetect option has currently no effect on the bios
#
# Examples:
#   ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17
#   ata0-slave:  type=disk, mode=flat, path=20M.sample, cylinders=615, heads=4, spt=17
#   ata1-master: type=disk, mode=flat, path=30M.sample, cylinders=615, heads=6, spt=17
#   ata1-slave:  type=disk, mode=flat, path=46M.sample, cylinders=940, heads=6, spt=17
#   ata2-master: type=disk, mode=flat, path=62M.sample, cylinders=940, heads=8, spt=17
#   ata2-slave:  type=disk, mode=flat, path=112M.sample, cylinders=900, heads=15, spt=17
#   ata3-master: type=disk, mode=flat, path=483M.sample, cylinders=1024, heads=15, spt=63
#   ata3-slave:  type=cdrom, path=iso.sample, status=inserted
#=======================================================================
#ata0-master: type=disk, mode=flat, path="30M.sample", cylinders=615, heads=6, spt=17
#ata0-slave: type=cdrom, path=D:, status=inserted
#ata0-slave: type=cdrom, path=/dev/cdrom, status=inserted
#ata0-slave: type=cdrom, path="drive", status=inserted
#ata0-slave: type=cdrom, path=/dev/rcd0d, status=inserted 

#=======================================================================
# BOOT:
# This defines the boot sequence. Now you can specify up to 3 boot drives.
# You can either boot from 'floppy', 'disk' or 'cdrom'
# legacy 'a' and 'c' are also supported
# Examples:
#   boot: floppy
#   boot: disk
#   boot: cdrom
#   boot: c
#   boot: a
#   boot: cdrom, floppy, disk
#=======================================================================
#boot: floppy
#boot: disk

#=======================================================================
# CLOCK:
# This defines the parameters of the clock inside Bochs:
#
#  SYNC:
#  TO BE COMPLETED (see Greg explanation in feature request #536329)
#
#  TIME0:
#  Specifies the start (boot) time of the virtual machine. Use a time 
#  value as returned by the time(2) system call. If no time0 value is 
#  set or if time0 equal to 1 (special case) or if time0 equal 'local', 
#  the simulation will be started at the current local host time.
#  If time0 equal to 2 (special case) or if time0 equal 'utc',
#  the simulation will be started at the current utc time.
#
# Syntax:
#  clock: sync=[none|slowdown|realtime|both], time0=[timeValue|local|utc]
#
# Example:
#   clock: sync=none,     time0=local       # Now (localtime)
#   clock: sync=slowdown, time0=315529200   # Tue Jan  1 00:00:00 1980
#   clock: sync=none,     time0=631148400   # Mon Jan  1 00:00:00 1990
#   clock: sync=realtime, time0=938581955   # Wed Sep 29 07:12:35 1999
#   clock: sync=realtime, time0=946681200   # Sat Jan  1 00:00:00 2000
#   clock: sync=none,     time0=1           # Now (localtime)
#   clock: sync=none,     time0=utc         # Now (utc/gmt)
# 
# Default value are sync=none, time0=local
#=======================================================================
#clock: sync=none, time0=local


#=======================================================================
# FLOPPY_BOOTSIG_CHECK: disabled=[0|1]
# Enables or disables the 0xaa55 signature check on boot floppies
# Defaults to disabled=0
# Examples:
#   floppy_bootsig_check: disabled=0
#   floppy_bootsig_check: disabled=1
#=======================================================================
#floppy_bootsig_check: disabled=1
floppy_bootsig_check: disabled=0

#=======================================================================
# LOG:
# Give the path of the log file you'd like Bochs debug and misc. verbiage
# to be written to. If you don't use this option or set the filename to
# '-' the output is written to the console. If you really don't want it,
# make it "/dev/null" (Unix) or "nul" (win32). :^(
#
# Examples:
#   log: ./bochs.out
#   log: /dev/tty
#=======================================================================
#log: /dev/null
log: bochsout.txt

#=======================================================================
# LOGPREFIX:
# This handles the format of the string prepended to each log line.
# You may use those special tokens :
#   %t : 11 decimal digits timer tick
#   %i : 8 hexadecimal digits of cpu current eip (ignored in SMP configuration)
#   %e : 1 character event type ('i'nfo, 'd'ebug, 'p'anic, 'e'rror)
#   %d : 5 characters string of the device, between brackets
# 
# Default : %t%e%d
# Examples:
#   logprefix: %t-%e-@%i-%d
#   logprefix: %i%e%d
#=======================================================================
#logprefix: %t%e%d

#=======================================================================
# LOG CONTROLS
#
# Bochs now has four severity levels for event logging.
#   panic: cannot proceed.  If you choose to continue after a panic, 
#          don't be surprised if you get strange behavior or crashes.
#   error: something went wrong, but it is probably safe to continue the
#          simulation.
#   info: interesting or useful messages.
#   debug: messages useful only when debugging the code.  This may
#          spit out thousands per second.
#
# For events of each level, you can choose to crash, report, or ignore.
# TODO: allow choice based on the facility: e.g. crash on panics from
#       everything except the cdrom, and only report those.
#
# If you are experiencing many panics, it can be helpful to change
# the panic action to report instead of fatal.  However, be aware
# that anything executed after a panic is uncharted territory and can 
# cause bochs to become unstable.  The panic is a "graceful exit," so
# if you disable it you may get a spectacular disaster instead.
#=======================================================================
panic: action=ask
error: action=report
info: action=report
debug: action=ignore
#pass: action=fatal

#=======================================================================
# DEBUGGER_LOG:
# Give the path of the log file you'd like Bochs to log debugger output.
# If you really don't want it, make it /dev/null or '-'. :^(
#
# Examples:
#   debugger_log: ./debugger.out
#=======================================================================
#debugger_log: /dev/null
#debugger_log: debugger.out
debugger_log: -

#=======================================================================
# COM1, COM2, COM3, COM4:
# This defines a serial port (UART type 16550A). In the 'term' you can specify
# a device to use as com1. This can be a real serial line, or a pty.  To use
# a pty (under X/Unix), create two windows (xterms, usually).  One of them will
# run bochs, and the other will act as com1. Find out the tty the com1
# window using the `tty' command, and use that as the `dev' parameter.
# Then do `sleep 1000000' in the com1 window to keep the shell from
# messing with things, and run bochs in the other window.  Serial I/O to
# com1 (port 0x3f8) will all go to the other window.
# Other serial modes are 'null' (no input/output), 'file' (output to a file
# specified as the 'dev' parameter), 'raw' (use the real serial port - under
# construction for win32), 'mouse' (standard serial mouse - requires
# mouse option setting 'type=serial' or 'type=serial_wheel') and 'socket'
# (connect a networking socket).
#
# Examples:
#   com1: enabled=1, mode=null
#   com1: enabled=1, mode=mouse
#   com2: enabled=1, mode=file, dev=serial.out
#   com3: enabled=1, mode=raw, dev=com1
#   com3: enabled=1, mode=socket, dev=localhost:8888
#=======================================================================
#com1: enabled=1, mode=term, dev=/dev/ttyp9


#=======================================================================
# PARPORT1, PARPORT2:
# This defines a parallel (printer) port. When turned on and an output file is
# defined the emulated printer port sends characters printed by the guest OS
# into the output file. On some platforms a device filename can be used to
# send the data to the real parallel port (e.g. "/dev/lp0" on Linux, "lpt1" on
# win32 platforms).
#
# Examples:
#   parport1: enabled=1, file="parport.out"
#   parport2: enabled=1, file="/dev/lp0"
#   parport1: enabled=0
#=======================================================================
parport1: enabled=1, file="parport.out"

#=======================================================================
# SB16:
# This defines the SB16 sound emulation. It can have several of the
# following properties.
# All properties are in the format sb16: property=value
# midi: The filename is where the midi data is sent. This can be a
#       device or just a file if you want to record the midi data.
# midimode:
#      0=no data
#      1=output to device (system dependent. midi denotes the device driver)
#      2=SMF file output, including headers
#      3=output the midi data stream to the file (no midi headers and no
#        delta times, just command and data bytes)
# wave: This is the device/file where wave output is stored
# wavemode:
#      0=no data
#      1=output to device (system dependent. wave denotes the device driver)
#      2=VOC file output, incl. headers
#      3=output the raw wave stream to the file
# log:  The file to write the sb16 emulator messages to.
# loglevel:
#      0=no log
#      1=resource changes, midi program and bank changes
#      2=severe errors
#      3=all errors
#      4=all errors plus all port accesses
#      5=all errors and port accesses plus a lot of extra info
# dmatimer:
#      microseconds per second for a DMA cycle.  Make it smaller to fix
#      non-continuous sound.  750000 is usually a good value.  This needs a
#      reasonably correct setting for the IPS parameter of the CPU option.
#
# For an example look at the next line:
#=======================================================================

#sb16: midimode=1, midi=/dev/midi00, wavemode=1, wave=/dev/dsp, loglevel=2, log=sb16.log, dmatimer=600000

#=======================================================================
# VGA_UPDATE_INTERVAL:
# Video memory is scanned for updates and screen updated every so many
# virtual seconds.  The default is 40000, about 25Hz. Keep in mind that
# you must tweak the 'cpu: ips=N' directive to be as close to the number
# of emulated instructions-per-second your workstation can do, for this
# to be accurate.
#
# Examples:
#   vga_update_interval: 250000
#=======================================================================
vga_update_interval: 300000

# using for Winstone '98 tests
#vga_update_interval:  100000

#=======================================================================
# KEYBOARD_SERIAL_DELAY:
# Approximate time in microseconds that it takes one character to
# be transfered from the keyboard to controller over the serial path.
# Examples:
#   keyboard_serial_delay: 200
#=======================================================================
keyboard_serial_delay: 250

#=======================================================================
# KEYBOARD_PASTE_DELAY:
# Approximate time in microseconds between attempts to paste
# characters to the keyboard controller. This leaves time for the
# guest os to deal with the flow of characters.  The ideal setting
# depends on how your operating system processes characters.  The
# default of 100000 usec (.1 seconds) was chosen because it works 
# consistently in Windows.
#
# If your OS is losing characters during a paste, increase the paste
# delay until it stops losing characters.
#
# Examples:
#   keyboard_paste_delay: 100000
#=======================================================================
keyboard_paste_delay: 100000

#=======================================================================
# MOUSE: 
# This option prevents Bochs from creating mouse "events" unless a mouse
# is  enabled. The hardware emulation itself is not disabled by this.
# You can turn the mouse on by setting enabled to 1, or turn it off by
# setting enabled to 0. Unless you have a particular reason for enabling
# the mouse by default, it is recommended that you leave it off.
# You can also toggle the mouse usage at runtime (control key + middle
# mouse button on X11, SDL, wxWidgets and Win32).
# With the mouse type option you can select the type of mouse to emulate.
# The default value is 'ps2'. The other choices are 'imps2' (wheel mouse
# on PS/2), 'serial', 'serial_wheel' (one com port requires setting
# 'mode=mouse') and 'usb' (3-button mouse - one of the USB ports must be
# connected with the 'mouse' device - requires PCI and USB support).
#
# Examples:
#   mouse: enabled=1
#   mouse: enabled=1, type=imps2
#   mouse: enabled=1, type=serial
#   mouse: enabled=0
#=======================================================================
mouse: enabled=0

#=======================================================================
# private_colormap: Request that the GUI create and use it's own
#                   non-shared colormap.  This colormap will be used
#                   when in the bochs window.  If not enabled, a
#                   shared colormap scheme may be used.  Not implemented
#                   on all GUI's.
#
# Examples:
#   private_colormap: enabled=1
#   private_colormap: enabled=0
#=======================================================================
private_colormap: enabled=0

#=======================================================================
# fullscreen: ONLY IMPLEMENTED ON AMIGA
#             Request that Bochs occupy the entire screen instead of a 
#             window.
#
# Examples:
#   fullscreen: enabled=0
#   fullscreen: enabled=1
#=======================================================================
#fullscreen: enabled=0
#screenmode: name="sample"

#=======================================================================
# ne2k: NE2000 compatible ethernet adapter
#
# Examples:
# ne2k: ioaddr=IOADDR, irq=IRQ, mac=MACADDR, ethmod=MODULE, ethdev=DEVICE, script=SCRIPT
#
# ioaddr, irq: You probably won't need to change ioaddr and irq, unless there
# are IRQ conflicts.
#
# mac: The MAC address MUST NOT match the address of any machine on the net.
# Also, the first byte must be an even number (bit 0 set means a multicast
# address), and you cannot use ff:ff:ff:ff:ff:ff because that's the broadcast
# address.  For the ethertap module, you must use fe:fd:00:00:00:01.  There may
# be other restrictions too.  To be safe, just use the b0:c4... address.
#
# ethdev: The ethdev value is the name of the network interface on your host
# platform.  On UNIX machines, you can get the name by running ifconfig.  On
# Windows machines, you must run niclist to get the name of the ethdev.
# Niclist source code is in misc/niclist.c and it is included in Windows 
# binary releases.
#
# script: The script value is optional, and is the name of a script that 
# is executed after bochs initialize the network interface. You can use 
# this script to configure this network interface, or enable masquerading.
# This is mainly useful for the tun/tap devices that only exist during
# Bochs execution. The network interface name is supplied to the script
# as first parameter
#
# If you don't want to make connections to any physical networks,
# you can use the following 'ethmod's to simulate a virtual network.
#   null: All packets are discarded, but logged to a few files.
#   arpback: ARP is simulated. Disabled by default.
#   vde:  Virtual Distributed Ethernet
#   vnet: ARP, ICMP-echo(ping), DHCP and read/write TFTP are simulated.
#         The virtual host uses 192.168.10.1.
#         DHCP assigns 192.168.10.2 to the guest.
#         TFTP uses the ethdev value for the root directory and doesn't
#         overwrite files.
#
#=======================================================================
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=fbsd, ethdev=en0 #macosx
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=MYCARD
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=null, ethdev=eth0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
pnic: mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun:tap0
#ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun:tap0

#=======================================================================
# KEYBOARD_MAPPING:
# This enables a remap of a physical localized keyboard to a 
# virtualized us keyboard, as the PC architecture expects.
# If enabled, the keymap file must be specified.
# 
# Examples:
#   keyboard_mapping: enabled=1, map=gui/keymaps/x11-pc-de.map
#=======================================================================
keyboard_mapping: enabled=0, map=

#=======================================================================
# KEYBOARD_TYPE:
# Type of keyboard return by a "identify keyboard" command to the
# keyboard controler. It must be one of "xt", "at" or "mf".
# Defaults to "mf". It should be ok for almost everybody. A known
# exception is french macs, that do have a "at"-like keyboard.
#
# Examples:
#   keyboard_type: mf
#=======================================================================
#keyboard_type: mf

#=======================================================================
# USER_SHORTCUT:
# This defines the keyboard shortcut to be sent when you press the "user"
# button in the headerbar. The shortcut string is a combination of maximum
# 3 key names (listed below) separated with a '-' character. The old-style
# syntax (without the '-') still works for the key combinations supported
# in Bochs 2.2.1.
# Valid key names:
# "alt", "bksl", "bksp", "ctrl", "del", "down", "end", "enter", "esc",
# "f1", ... "f12", "home", "ins", "left", "menu", "minus", "pgdwn", "pgup",
# "plus", "right", "shift", "space", "tab", "up", and "win".
#
# Example:
#   user_shortcut: keys=ctrl-alt-del
#=======================================================================
user_shortcut: keys=ctrl-alt-del

#=======================================================================
# I440FXSUPPORT:
# This option controls the presence of the i440FX PCI chipset. You can
# also specify the devices connected to PCI slots. Up to 5 slots are
# available now. These devices are currently supported: ne2k, pcivga,
# pcidev and pcipnic. If Bochs is compiled with Cirrus SVGA support
# you'll have the additional choice 'cirrus'.
#
# Example:
#   i440fxsupport: enabled=1, slot1=pcivga, slot2=ne2k
#=======================================================================
i440fxsupport: enabled=1, slot1=pcipnic
#i440fxsupport: enabled=1, slot1=ne2k

#=======================================================================
# USB1:
# This option controls the presence of the USB root hub which is a part
# of the i440FX PCI chipset. With the portX option you can connect devices
# to the hub (currently supported: 'mouse' and 'keypad'). If you connect
# the mouse to one of the ports and use the mouse option 'type=usb' you'll
# have a 3-button USB mouse.
#
# Example:
#   usb1: enabled=1, port1=mouse, port2=keypad
#=======================================================================
#usb1: enabled=1

#=======================================================================
# CMOSIMAGE:
# This defines image file that can be loaded into the CMOS RAM at startup.
# The rtc_init parameter controls whether initialize the RTC with values stored
# in the image. By default the time0 argument given to the clock option is used.
# With 'rtc_init=image' the image is the source for the initial time.
#
# Example:
#   cmosimage: file=cmos.img, rtc_init=image
#=======================================================================
#cmosimage: file=cmos.img, rtc_init=time0

#=======================================================================
# other stuff
#=======================================================================
magic_break: enabled=1
#load32bitOSImage: os=nullkernel, path=../kernel.img, iolog=../vga_io.log
#load32bitOSImage: os=linux, path=../linux.img, iolog=../vga_io.log, initrd=../initrd.img
#text_snapshot_check: enable

#-------------------------
# PCI host device mapping
#-------------------------
#pcidev: vendor=0x1234, device=0x5678

#=======================================================================
# GDBSTUB:
# Enable GDB stub. See user documentation for details.
# Default value is enabled=0.
#=======================================================================
#gdbstub: enabled=0, port=1234, text_base=0, data_base=0, bss_base=0

#=======================================================================
# IPS:
# The IPS directive is DEPRECATED. Use the parameter IPS of the CPU
# directive instead.
#=======================================================================
#ips: 10000000

#=======================================================================
# for Macintosh, use the style of pathnames in the following
# examples.
#
# vgaromimage: :bios:VGABIOS-elpin-2.40
# romimage: file=:bios:BIOS-bochs-latest, address=0xf0000
# floppya: 1_44=[fd:], status=inserted
#=======================================================================
