Commands.MD

ghex first.bin 

hexdump first.bin 

qemu-system-x86_64 first.bin

qemu-system-x86_64 -drive file=first.bin,format=raw

qemu-system-x86_64 -nographic -drive file=first.bin,format=raw

In Qemu, go to monitor in graphic mode:

• Ctrl+Alt+2

In Qemu with -nographic:

• Ctrl+ A, X to exit
• Ctrl+ A, C to go to monitor

In Qemu monitor:

• xp /ni address to disassemble n bytes start from address

Qemu Monitor docs