What is this computer (picture)

[Göran Axelsson]

John Foust wrote:
> At 09:14 AM 5/19/2009, Pontus Pihlgren wrote:
>   
>> Not sure if it has a bell, but a quick google tells me it is a Princeton 
>> Gamma Tech System 4:
>>
>> http://www.retrotechnology.com/herbs_stuff/dec.html
>>     
>
> I've got one of those attached to my SEM.
>
> - John
>   

For those not at home in the electron microscope business, it is the 
measurement computer for an EDS system, Energy Dispersive Spectroscopy, 
that measures the energy in single x-rays emitted from a test sample in 
a Scanning Electron Microscope or a Transmision Electron Microscope. 
With it and the detector system you could see which elements that makes 
up a sample.

I've got a PGT 1000 with an Alpha LSI in the base. The same form factor 
but the computer takes up the full base. My system is equipped with a 16 
kword 16 bit core memory.
It started when I turned the power on for the first time showing the 
graph from the last measurement, I just love core memory. Sadly the 
computer crashed when I pressed "CLEAR". I suspect that I have an EPROM 
problem but haven't had time to do anything more with it.

There are manuals on bitsavers at 
http://www.bitsavers.org/pdf/computerAutomation/
and a collector in Sweden http://www.sdu.se/computer-automation-museum/

Anyone got a spare front panel for Alpha LSI or schematics of it?

/Göran