Equivalent to i686 arch of most linux distros, (actually has a slightly more recent instruction set, as i686 is Pentium III), this is likely the older x86 hardware you might want to use.

Package architectureTargetSubtarget BrandModelVersion
i386_pentium4x86Evaluation boards / unbranded boardsMinnowboard Max
i386_pentium4x86PC EnginesWRAP
i386_pentium4x86QEMU (i386)qemu-system-i3860.12.5
i386_pentium4x86QEMU (x86_64)qemu-system-x86_64>2.0
i386_pentium4x86VMwareVMware x86 virtual machine2015 latest