VT100 and/or VT105 rescued from scrap

Johnny Billquist bqt at update.uu.se
Thu Oct 22 08:15:23 CDT 2015

On 2015-10-22 15:05, william degnan wrote:
>>> 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.


The VT100 is field upgradeable to a VT101 (I think) or a VT102 (I know). 
However, the VT102 is not the same as a VT100 with the added AVO and 
printer. Functionally they are the same, but inside they will look 

The VT102 have a motherboard with the AVO and printer option integrated 
into the motherboard itself. A VT100 with the options added will have a 
daughterboard and components added to it's motherboard.

So, the VT102 do not start out as a VT100 and then some stuff added.

There were (if I remember right) some other options for the VT100 as 
well. You cannot add those other options to a VT102 either. The VT102 is 
pretty much a fixed and finished product as it is. The VT100 on the 
other hand could be expanded in various ways.

The VT102 was basically a cost reduced solution with a fixed set of 
options, which were the ones most commonly asked for and used.

And, as I mentioned, they redesignated some keyboard LEDs on the VT102 
for specific information. Thus, on a VT100 you have four user 
programmable LEDs on the keyboard, but on the VT102 you only have one.


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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