Qemu

https://wiki.gentoo.org/wiki/QEMU/Options

Run NetBSD

Create disk

qemu-img create -f qcow2 ~/qemu-vms/netbsd-disk.img 50G

qemu-img info ~/qemu-vms/netbsd-disk.img

qemu-img create -f qcow2 ~/qemu-vms/netbsd.qcow2 20G

Install

qemu-system-x86_64
-accel hvf
-m 1024M
-drive file=/Users/gv/qemu-vms/netbsd-disk.img,index=0,media=disk,format=qcow2
-cdrom ~/data/iso/NetBSD-9.0-amd64.iso
-boot d

-display curses \
-net nic \
-net user

qemu-system-x86_64
-m 2048
-vga std
-cdrom ~/Downloads/NetBSD-9.2-amd64.iso
-accel hvf
-display cocoa,show-cursor=on
-usb -device usb-kbd -device usb-tablet
-drive file=/Users/geoffroy.vergne/qemu-vms/netbsd.qcow2,if=virtio
-cpu Penryn,vendor=GenuineIntel
-smp 2

Run

-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none]

qemu-system-x86_64
-accel hvf
-drive file=/Users/gv/qemu-vms/netbsd-disk.img,index=0,media=disk,format=qcow2
-cpu host
-smp 2
-m 1024M
-vnc unix:/Users/gv/qemu-vms/.qemu-myvm-vnc
-daemonize

-vga std \
-vnc 0.0.0.0:0

-global VGA.vgamem_mb=128

qemu-system-x86_64
-m 2048
-vga std
-accel hvf
-display cocoa,show-cursor=off
-usb -device usb-kbd -device usb-tablet
-drive file=/Users/geoffroy.vergne/qemu-vms/netbsd.qcow2,if=virtio
-cpu Penryn,vendor=GenuineIntel
-smp 2