Note that while in theory the AVO was an added
option, the VT102 did not
have it (or the printer port) as separate parts that were
added to a basic
VT100. The VT102 had a different board with all those options already on
the motherboard, and no additional options could be installed.
So, you cannot take the AVO options out of a VT102 and add it to a VT100
(for example).
Also, for example, the keyboard on a VT100 differs from a VT102.
You could use a VT100 keyboard on a VT102, and vice versa, but the LEDs on
the keyboard of a VT102 are used for different things than on a VT100.
Johnny
Thanks for the clarification. I you're saying for the 101 and 102 you
start with a core terminal at the factory and they add the options or it's
a field upgrade kind of thing because parts not swapped out easily or
added. I confirm about the ROMs too, I noticed that the SetUp menus differ
depending on what options are installed.