The x86 platform includes all 32-bit Intel and Intel compatible processors ranging from i386 to i786 processors. For the purposes of installation, the x86_64 architecture, including all AMD64 and Intel 64-bit processors, is identical in function and included in this page.
Please note that the minimum supported processor is i486. This is not a limitation specific to HitchHiker, but a limitation of the Linux Kernel itself and Glibc. Should you have a computer of this vintage, and wish to get it running, you have the choice of installing an older and likely unsupported distribution, or installing an operating system descended from 4.4BSD (FreeBSD, NetBSD, and OpenBSD).