Interest in TTY interfacing or PDP-8 W076 and/or M452 replacements/enhancement cards?

That is certainly a possibility. The problem is that the barrier-to-entry for obtaining the technology would remain pretty high. Only those with the capability to create their own boards would be able to participate. I expect there are those who would like to get their 8i/8L/TTY working (or working better) without that hassle. The need to create an edge connector for the PDP-8 boards means perf-board technique is not generally adequate for them. I am actually trending toward an opinion that the PCB board manufacturers earn their money, since even the single unit prototype prices are only about $30 (plus shipping) per board, vs. hours of work for me to photo-etch, cut, drill, stuff, and debug each board. There is also equipment involved -- not everyone has a darkroom, a bandsaw, and a drill press. (I'll grant they probably do have soldering capability :-).) I had expected that if there was sufficient interest, an archive site could be talked into carrying the schematics/layouts/parts-lists. (There are issues of file formats.) Still, it beats having me working alone in my basement, so I'd want to find a way to publish the information even if there isn't sufficient interest for a board run. (Let me know if you want the information now, and if you can read EAGLE formats.) It is essentially a MAX232A and a quad opto-isolator (plus passives and connectors) for each of the converter boards. The oscillator board takes a 5.0688Mhz resonator can, a mess of TTL ICs, (3x74LS393, 2x74LS86, 7440, 74LS151, 74LS157, 74123), and lots of bypass caps :-). Thanks, Vince