Gns3

ASA on GNS3:

go to edit > preferences > qemu
click ASA tab
name it
give it 1024MB ram
qemu options: -vnc none -vga none -m 1024 -icount auto -hdachs 980,16,32 
for more than 1 asa, change "-vnc none" to "vnc <num>" where num is the number of ASAs
import initrd image
import vmlinuz image
kernel cmd line: -append ide_generic.probe_mask=0x01 ide_core.chs=0.0:980,16,32 auto nousb console=ttyS0,9600 bigphysarea=65536
click save

Once the ASA is up, enter enable and then enter the following to activate features:
activation-key <KEY-REDACTED>

qemu must be installed.

you may need to change the location of qemu and qemu-img. on linux, mine was located at:
/usr/share/qemu
/usr/bin/qemu-img

if qemuwrapper doesnt work, it may be because the location is wrong. in linux, it may be located at:
/usr/share/doc/gns3/qemuwrapper.py