VT100 and/or VT105 rescued from scrap

[william degnan]

On Wed, Oct 21, 2015 at 3:29 PM, tony duell <ard at p850ug1.demon.co.uk> wrote:

> [VT100, etc, monitor PCB]
>
> > Is that true of the vt102 as well?
>
> I don't think I've ever worked on a VT102, but the same video monitor
> boards turn up
> in the VT100, VT105 and VT101 (at least). There are at least 3 different
> types, at least
> 2 made by Ball Brothers. From what I remember the 2 Ball Brothers ones
> I've seen are
> very similar, the main difference being the video amplifier.
>
> What is different between the terminals is the PSU. The VT100 and VT105
> use an SMPSU
> that is actually quite friendly to work on (there is a separate linear
> supply to start it up,
> the pscillator and control circuits are on the output side of the
> isolation barrier with
> transformer coupling to the base of the chopper. The VT101 has a big mains
> transformer
> and a linear regualtor board.
>
> -tony
>

VT101 and VT102 are the same, the 01 and 02 pertain to options that come
with the terminal.  I would *assume* they have the same PSU.

-- 
Bill