FPGA VAX update, now DIY TTL computers

[Allison]

>
>Subject: Re: FPGA VAX update, now DIY TTL computers
>   From: "Chuck Guzis" <cclist at sydex.com>
>   Date: Wed, 09 Nov 2005 09:46:07 -0800
>     To: cctalk at classiccmp.org
>
>On 11/9/2005 at 10:46 AM Allison wrote:
>
>>The serious limitation for tubes has always been the heat and power
>>from the filament rather than the heat and power used for functional 
>>circuits. 
>
>So whatever happened to tunnel cathodes?  It was a very hot topic in the
>60's.

Not much after that.  An idea that came too late in the game. 

If anything there were more unique designs in the gated beam, sheet beam
and segmented cathode (power tubes) that evolved.


Allison