VT100 and/or VT105 rescued from scrap

[Johnny Billquist]

On 2015-10-22 15:32, william degnan wrote:
> Let me clarify... I agree the 100 is a separate machine from the "core
> 101/102" terminal, even with the same options.
>
> On my vt100 the ROM is different than my vt102, but my 100 has the 132 char
> graphics upgrade so it's functionally like the 102 in that way.  Looks
> differently inside.

Having 132 columns does not necessarily mean anything.
A standard VT100 have 132 columns. However, it only have 12 lines when 
in 132 column mode. It also have only one attribute on characters, which 
is either underline or reverse. And that depends on what style of cursor 
you have.

The AVO options adds 132 columns with 24 lines, as well as all four 
attributes.

	Johnny

>
> On Thu, Oct 22, 2015 at 9:15 AM, Johnny Billquist <bqt at update.uu.se> wrote:
>
>> 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.
>>>
>>
>> No.
>>
>> 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
>> different.
>>
>> 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
>>
>> --
>> 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
>>
>
>
>


-- 
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