21 Jan
2018
21 Jan
'18
10:48 a.m.
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:
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
On 1/21/18 10:04 AM, Paul Koning via cctalk wrote:
the phosphor is long-persistance green 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.