I posted a scan of an original manual for a Zenith ZEN101D universal remote control.
This remote is very simple (5 buttons: big buttons for power on/off, channel up/down, volume updown, and small buttons for mute and closed-caption). The manual says the code for a Vizio TV is 0709, but that did not work with a Vizio VX32L; however, 0002 does work.