Sufficiently Small

1984: BBC Model B Computer 2 MHz 8-bit 6502 CPU, 32 KiB RAM. OS 1.2
1988: Acorn A3000 8 MHz 32-bit ARM2 CPU, 1 MiB RAM. RISCOS 2
1990: Acorn Archimedes A420/1 8 MHz 32-bit ARM2 CPU, 2 MiB RAM, 20 MB hard disk. RISC OS 2
1992: Acorn A4000 12 MHz 32-bit ARM250 CPU, 2 MiB RAM, 80 MB hard disk. RISCOS 3
1994: Generic PC. 66 MHz 486 DX2 32-bit CPU, 4 MiB RAM, MS-DOS and Windows 3.1
1997: Generic PC. 333 MHz Pentium II 32-bit CPU, 64 MB RAM. 6.4 GB disk. Windows 95.
2000: Generic PC 500 MHz AMD Athlon 32-bit CPU, 128 MB RAM. 18 GB disk. Windows 2000.
2001: Generic PC 2 x 533 MHz Celeron 32-bit CPUs, 128 MB RAM. 18 GB disk. Windows 2000.
2003: Generic PC 1 GHz AMD Athlon 32-bit CPU, 256 MB RAM. 18 GB disk. Windows 2000.
2003: Toshiba Portege R100. 900 MHz Pentium M 32-bit CPU, 768 MB RAM. 30 GB disk. Windows XP
2004: Sun Microsystems Sunblade 100. 500 MHz UltraSPARC IIi 64-bit CPU, 768 MB RAM. 80 GB disk. Solaris 10.
2006: Apple Mac Mini. 1.66 GHz Core Duo. 32-bit CPU. 512 MB RAM. 80 GB disk. Mac OS X Tiger