This is an step by step guide to install MINIX using USB on Intel PC.
Disclaimer: this is only a workaround, because there is no actual USB support. Use it as your own risk!
Please make sure your system meets the Installation Requirements.
Now it's time to launch Qemu. Other virtualization or emulation platforms could also work, but Qemu is an open source emulator that is ported to nearly all OSes.
Issue the following command: (explained below). You will have to customize the command for your bootable USB platform. Be patient, as it may be very slow if not used in conjunction with KVM:
qemu-system-i386 -m 512 -drive file=/dev/wd0c,format=raw,media=disk -cdrom /tmp/minix_R3.3.0.iso -boot d &
qemu-system-i386 -m 512
Fire up a VM using x86 platform and 512MB memory.
Target machine physical hard disk. This is the drive where Minix is going to be installed. An OpenBSD live USB is used in this guide. If using NetBSD, change wdXc to wdXe. For linux change wdXc to sdX (where X is the hard disk letter, e.g.: sda, without partition number). This is very important, the idea is to point to whole physical hard disk, not to a partition! The format=raw part is to bypass the qemu protection of the MBR sector of the target disk: the installation program in the VM need to write Master Boot Record and Partition Boot Sector in the hard disk to boot the kernel. If Minix doesn't have full access to the disk, the system won't boot natively when rebooted.
-cdrom /tmp/minix_R3.3.0.iso -boot d
Boot from MINIX iso as CD-ROM. Replace with the correct folder location and filename of the ISO downloaded in step 3.
When the above command is issued, the VM will start. Now install normally, by following the Installation guide.
Be careful with partitions if there are any other OSes installed in the target hard disk. It is recommended that Minix be installed on its own dedicated hard disk. During installation, select the appropriate target machine's native ethernet card, not what MINIX selects automatically, as this selection will only work within Qemu.
When the installation is finished, shutdown virtual machine.
At this point, if you don't have any bootloader installed, install one. There are some bootloaders that don't require a partition, like GAG. Or edit the one you are using if you are multibooting. In some weird cases, marking the partition active isn't enough. It requires a bootloader in MBR
Shutdown your live USB instance and reboot natively from the hard disk, and if everything goes well, congratulations, you have MINIX installed via USB!
Now you should also read the Post Installation guide.
Tested and successfully on Acer AO751h Netbook/Ultrabook with versions 3.3.0 (stable), 3.4.0rc2 (current development snapshot) and 3.2.1 (previous stable), everything works except wireless.