[neonixie-l] Re: Divergent Nixie clock designs

2018-06-04 Thread gregebert
Long live PALASM !   I used CUPL a few times in the late 1980's.

Were you able to program your device at home ? Most of the tools back then 
were not free, and out-of-reach for hobbyists.
I remember sneaking into the lab during lunch hour to program EPROMs.

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[neonixie-l] Re: Divergent Nixie clock designs

2018-06-04 Thread threeneurons
I've made a clock using a CPLD, the little brother of the FPGA:

https://threeneurons.files.wordpress.com/2018/06/mach210_clk.pdf

AMD MACH210. It was made quite a while ago. I guess MACH210 chips are 
vintage now.

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[neonixie-l] Re: Anita Mk9 restoration

2018-06-04 Thread threeneurons
Great find !

Working high speed Ericsson dekatrons are next to impossible to find. The 
GS10D has the same pinout as the slower GS10C, and 6476/6476A. Also the 
GS10C is designed to operate at lower currents, but it may work, if you can 
reduce the clock rate. For short term operation, running the GS10C over its 
design limits does no permanent damage. Something to consider, until a 
working GS10D shows up.

An excessive portion of high speed dekatrons are found to be duds. Usually 
no gas, to ionize. This rarely happens with standard speed (neon gas / 
orange) dekatrons. The gas in the high speed tubes, I believe is either 
hydrogen or helium. Blue/violet glow is not unique to argon, as some 
assume. If the gas is helium, it can diffuse right thru glass. If its 
hydrogen, it can bond with the tube's metal structures. In either case, 
over time, tubes with these gases will go bad, just by sitting on the 
shelf. And these tubes have not been made in decades. 

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