> On Jan 21, 2018, at 10:13 AM, Al Kossow via cctalk <cctalk@classiccmp.org> > wrote: > > > > On 1/21/18 10:12 AM, Al Kossow via cctalk wrote: >> >> >> 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
