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skystrick
September 24th, 2014, 05:13 PM
So this VT220-compatible terminal was evidently quite popular during the 1980s, because it keeps popping up with a different brand name on it every time I see it:

Here it is as the Motorola M220 a/k/a TM220:
http://www.angelfire.com/amiga/pc100/m220-4.GIF

Here it is as the Olivetti WS685:
http://compvter.it/images/3/37/Olivetti_WS-685.jpg

Here it is as a McDonnell-Douglas Prism P9:
http://upload.wikimedia.org/wikipedia/commons/d/d2/Terminal-prism-p9.jpg

And here it is as an Ampex:
http://terminals.classiccmp.org/wiki/images/thumb/d/d1/Ampex_advertisement_Computerworld_23Mar1987.jpg/438px-Ampex_advertisement_Computerworld_23Mar1987.jpg

It's also been spotted as the Philips PH220.

So...who actually made this chameleon thing???

KC9UDX
September 24th, 2014, 05:20 PM
Mine is a ModGraph GX-2000, who I had assumed actually made it.

If you have a spare flyback laying round for it, I may have something you need. :)

It's a really nice terminal when it works.

skystrick
September 24th, 2014, 05:37 PM
Mine is a ModGraph GX-2000, who I had assumed actually made it.

I would love for you to post a photo of it!



If you have a spare flyback laying round for it, I may have something you need. :)

Unfortunately, I don't - but aren't flyback transformers standardized enough that you could grab one from a Wyse terminal and be on your way?

barythrin
September 25th, 2014, 07:57 AM
Not sure about terminals but I did think Olivetti actually made a lot of systems themselves that others re-badged.

KC9UDX
September 27th, 2014, 04:15 PM
I would love for you to post a photo of it!

Ask and ye shall receive:
20678

Unfortunately, my photo quality is very lacking.

More to follow



Unfortunately, I don't - but aren't flyback transformers standardized enough that you could grab one from a Wyse terminal and be on your way?
Possibly. I have had some successes and some failures mix-and-matching flybacks. I had searched for this one by part number, and found it to be fairly rare (and expensive!).

KC9UDX
September 27th, 2014, 04:24 PM
Has anyone opened any of these to see who made the gubbins?

What little I remember of Modgraph, I recall them manufacturing a lot of their own things, and don't recall them rebranding products from other manufacturers; especially since graphic terminals were their main product line, IIRC.

The main board in my GX-2000 does appear to be manufactured by, or at least, for, Modgraph.
206792068020681

Now, this doesn't mean the other ones were made by Modgraph. It just means the casework was probably bought from the same Taiwanese company. The CRT and associated electronics in this one are all no-name Taiwanese parts, IIRC. Perhaps some outfit in the ROC made the whole unit, and Modgraph replaced the control board? Or at least maybe the Taiwanese company made the whole unit minus the control board?

MicrocomputerSolutions
September 29th, 2014, 01:42 PM
Has anyone opened any of these to see who made the gubbins?

What little I remember of Modgraph, I recall them manufacturing a lot of their own things, and don't recall them rebranding products from other manufacturers; especially since graphic terminals were their main product line, IIRC.

The main board in my GX-2000 does appear to be manufactured by, or at least, for, Modgraph.
206792068020681

Now, this doesn't mean the other ones were made by Modgraph. It just means the casework was probably bought from the same Taiwanese company. The CRT and associated electronics in this one are all no-name Taiwanese parts, IIRC. Perhaps some outfit in the ROC made the whole unit, and Modgraph replaced the control board? Or at least maybe the Taiwanese company made the whole unit minus the control board?



When I was a Compupro/Viasyn System Center I sold a pile of these terminals which were actually made by Ampex (Ampex model numbers were: 210, 220, 230 (my favorite, worked great with virtual terminals on a Compupro System running Multi-User, Multi-Tasking ConCurrent DOS). Available with green or amber crt. Reasonably priced, and far and away more reliable than Wyse terminals which were being sold by the boat load, but which were having a 75% or worse failure rate during the warranty period. I never had a single Ampex terminal go bad within the warranty period, and most of the ones that failed after the warranty expired suffered from blown RS-232 chips on the ports. Easy enough to replace with good access to the logic board.

I'm still running one on my Compupro System, and have a spare that needs a video board or video board repair.

Al Kossow
September 29th, 2014, 04:57 PM
I sold a pile of these terminals which were actually made by Ampex (Ampex model numbers were: 210, 220, 230

manual at
http://bitsavers.org/pdf/ampex/Ampex_210_Operating_Manual_Apr84.pdf

blazeaster
June 12th, 2015, 11:03 AM
If anybody has an idea what keyboard i could convert for one of theese terminals (i have the Olivetti version) I will be very grateful.
I managed to find this, but it's not helping:

Keyboard pinout

Connector: 4-pin RJ (like telephone) connector, female at the computer (this is NOT a PC keyboard standard!):

. 1 2 3 4 .
+--U-U-U-U--+
| |
| |
| |
+---|___|---+

1 - PE
2 - +11V Vcc
3 - Data
4 - GND
source:http://computers.mcbx.netne.net/terminal/amp210/index.htm

iz8dwf
November 22nd, 2017, 12:53 PM
So this VT220-compatible terminal was evidently quite popular during the 1980s, because it keeps popping up with a different brand name on it every time I see it:

So...who actually made this chameleon thing???

My WS-685 has an Ampex motherboard and EPROMs stickers also say "(C) Ampex 1989" on them.
So I vote for Ampex.
By the way, the motherboard doesn't look anything like the ModGraph one, it has static RAMs only.
Just dusted it off and made sure it was still working (after replacing a couple of too-high-ESR electrolytics).
Frank IZ8DWF