Beam-penetration color CRT, Tektronix DAS 912x (was Re: Nice LAB11 brochure.)

[Eric Smith]

I got out my Tektronix DAS 9129 logic analyzer mainframe, which uses a
red/green/yellow beam penetration CRT.  It uses raster scan, whereas
my other device with a beam penetration CRT, the HP 1338A (also
red/green/yellow) is a vector (X-Y) display.

I'm pleased to find that the 9129 passes self-test and the display
works. Unfortunately I do not have any logic analyzer acquisition or
pattern generator modules for it, so other than admiring the pretty
display, it's only useful as a boat anchor.