In order:
Mattel Intellivision
IBM PC (8088-4.77 MHz, 128KB RAM (I went all out), 2 x 5 1/4" floppies, monochrome)
IBM PC AT (8086-6 MHz, 640KB RAM, a whopping 20MB hard drive that turned out to be a 30)
Homebuilt 80486-25sx, 12MB RAM, VGA, 270MB hard drive
Homebuilt Pentium 133MHz...