Misterious DEC-Module M7071

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sun Feb 23 13:56:44 2003

> Hi,
>
> I got a strange board in recentley. Made by DEC, Quad-heigh, Dual-width, only
> one double sided 2x18 pin edge-connector that is snmaller as usual, aperantley
> carrying only power-supply connections. Has some 80 SSI/MSI TTL-chips, one prom
> 19-10818-02, and 10pcs 93l422 256kx4 ram's. Chips have 1979 date codes.
>
> The strange thing about this board is, that there is hardley any external
> connections, there is 1 (one) split-lug terminal, and one 16 pole IC-socket, as
> normalley used for automated testing signal connection.
>
> On the solderside there is the wording: "Waveform Generator" and 5012514F-P1

Ah yes.. The board with the misleading name... I think I know what it is
-- heck I think I can find the printset for it.

>
> Who knows what this board is, and what it does? In what equipment was it used?

It fits into a VT100 (there's a little backplane that goes with it that
connects to the edge connector on the terminal logic board and to the
harness to the PSU/monitor) and turns it into a VT105. There's also a 16
(?) pin DIP jumper cable that connects between the 2 boards.

What it does is display 1 or 2 'waveforms' on the VT100. That is to say
you can define 2 points in each vertical dot column of the display, thus
displaying a graph of up to 2 mathematical functions. You can either
display just that point (for a normal graph) or all dots below it (for a
barchart/histogram).

althought it was very limited in the kind of things you could display, it
gave a fairly high resolution with very little memory, and was ideal for
the target application. I think the VT105 was standard on the MINC, etc.

-tony
Received on Sun Feb 23 2003 - 13:56:44 GMT