VT100 and/or VT105 rescued from scrap
robert.jarratt at ntlworld.com
Wed Oct 21 14:55:40 CDT 2015
> On 21 October 2015 at 20:52 william degnan <billdegnan at gmail.com> wrote:
> 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.
I have a 101 and a 102 and can confirm that the PSUs in both of mine are
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