Marc, Probably the best bet for an LMI Lambda emulator is Daniel Seagrave's LD GitHub project. See:
https://github.com/dseagrav/ld It has directions on where to get the LMI code (bitsavers) and how to set up the emulator. I use it quite a bit and it works quite well. Of course, it has mappings to a regular keyboard, not the LMI keyboard-- so you would have to create an interface and then change the LD code. Did find this link to a possible USB interface: https://web.archive.org/web/20150910154424/http://home.comcast.net/~mmcm/kbd/Technical.html The LispM mailing list might be a helpful source of information: http://lists.tunes.org/mailman/listinfo/lispm Mike