[Coco] CoCo vs EMP WAS--> Re: Coco Digest, Vol 24, Issue 48

[johnadonaldson at comcast.net]

I remember back when I worked at NASA in Houston, we were working on
the SAS problem and we used chips bought at a local Radio Shack store and 
they flyed a shuttle misson. We took one of the backup chips and gave it to
the local RS after the flight.

John Donaldson


-------------- Original message -------------- 

> MArk 
> 
> The first microprocessor in space abord the Shuttle for experiments 
> was an RCA 1802. Being CMOS and could indure the harsh 
> radiation of space, it powered some of the first experiments in the 
> Shuttle bay. 
> 
> james 
> 
> On 13 Sep 2005 at 16:18, Mark Marlette wrote: 
> 
> Date sent: Tue, 13 Sep 2005 16:18:23 -0500 
> From: Mark Marlette 
> To: coco at maltedmedia.com 
> Subject: Re: [Coco] CoCo vs EMP WAS--> Re: Coco Digest, Vol 24, 
> Issue 48 
> Send reply to: CoCoList for Color Computer Enthusiasts 
> 
> 
> 
> 
> > james, 
> > 
> > Rad harden **might** still be a requirment for certain 
> > devices/applications. I work for a defense contractor and we design 
> > weapon system for the future. DOD has removed many of the requiremnts 
> > for qualified parts. In the past we used ALOT of rescreened 
> > components. Normal parts that are tested/screened and certified. Take 
> > a $0.25 part and it becomes $125. Commercial/Industrial parts yields 
> > are so good that the add cost couldn't be validated. Most of the 
> > common electrical assemblies are call COTS(Consumer Off The Shelf) 
> > components. 
> > 
> > Control system is still our design. Electrical motor drives switching 
> > 1000A RMS at 650v 3 phase bus voltages.......... :) 
> > 
> > Mark 
> > 
> > Quoting jdaggett at gate.net: 
> > 
> > > Rogelio 
> > > 
> > > There are chambers set up to test semiconductors for EMP. 
> > > 
> > > IN fact a lot of CMOS devices will qualify. If I recall CMOS is more 
> > > immune than NMOS or PMOS to such events. Still the military in many 
> > > key equiptment use what is called radiation harden semiconductors. 
> > > One other method would be to enclose your Coco in a magnetic 
> > > shielded box that would supply around 100 dB of isolation. 
> > > 
> > > james. 
> > > 
> > > On 13 Sep 2005 at 15:03, Rogelio Perea wrote: 
> > > 
> > > Date sent: Tue, 13 Sep 2005 15:03:47 -0400 
> > > From: Rogelio Perea 
> > > To: coco at maltedmedia.com 
> > > Subject: [Coco] CoCo vs EMP WAS--> Re: Coco Digest, Vol 24, 
> > > Issue 48 Send reply to: CoCoList for Color Computer Enthusiasts 
> > > 
> > > 
> > > 
> > > 
> > > > It'd be interesting to somehow rig an EMP test vault and check out 
> > > the 
> > > > CoCo capacity to withstand such an event... 
> > > 
> > > 
> > > 
> > > -- 
> > > Coco mailing list 
> > > Coco at maltedmedia.com 
> > > http://five.pairlist.net/mailman/listinfo/coco 
> > > 
> > 
> > 
> > -- 
> > Coco mailing list 
> > Coco at maltedmedia.com 
> > http://five.pairlist.net/mailman/listinfo/coco 
> 
> 
> 
> -- 
> Coco mailing list 
> Coco at maltedmedia.com 
> http://five.pairlist.net/mailman/listinfo/coco