TRS-80 Model 1 (was: Arty computers (was: Re: PDP-11/70 in Yates Center, KS)

Chuck Guzis cclist at
Fri Feb 2 16:34:01 CST 2007

On 2 Feb 2007 at 15:41, Jim Isbell, W5JAI wrote:

> No, it was a 7070, "IBM seven oh seventy", and it used hundreds if not
> thousands of 12au7s or 12ax7s don't remember which it was.  And it was
> definitely NOT solid state.  

Jim, are you sure you're not thinking of the 650?  The 7090 was 
definitely all solid-state, as was the 7080.  The most detailed web 
account of the 7070 I can find here indicates that the machine was 
built up of SMS modules (like the 7090):


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