GT-40 etc.

[Guy Sotomayor Jr]

> On Jan 21, 2018, at 10:13 AM, Al Kossow via cctalk <cctalk at classiccmp.org> wrote:
> 
> 
> 
> On 1/21/18 10:12 AM, Al Kossow via cctalk wrote:
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>> On 1/21/18 10:04 AM, Paul Koning via cctalk wrote:
>> 
>>> Remember that the GT40 is a vector drawing display, not a raster scan.  So you need a tube and associated deflection machinery that can handle high frequency X and Y deflection waveforms accurately.  This is not easy, especially with magnetic deflection.  I don't know what DEC used
>> 
>> Electromagnetic
>> 
>> The deflection amps on vr14s and 17s were notorious for blowing out.
>> 
>> 
> 
> the phosphor is long-persistance green

HP made some wonderful 17” and 19” electrostatic deflection vector displays.  We had a pile of them at
CMU driven by a custom GDP (some had 10-bit DACs, some had 12-bit DACs) that was front-ended by
a PDP-11 (usually an 11/20).  It was a *wonderful* combination!

TTFN - Guy