[cctalk] Tektronix XD88 information/advice sought

Hi folks - I come humbly seeking help in regards to bringing up a strange and quite rare Tektronix workstation from the late 80s/early 90s. TEXT WALL WARNING! For the uninitiated, the XD88 was Tek's final attempt at penetrating the graphics workstation market before ultimately giving up and exclusively selling X terminals. They are Motorola 88k-based machines running UTek V, Tek's inhouse SVR3 port. The tower machines are quite interesting in that the "compute" and "graphics engine" sides are modular, technically independent, and can be run standalone or stacked together for more compute/graphics power depending on the customer's needs. They are also the only machines I have ever seen that use the IEEE 896 "Futurebus," and although I could ramble for much longer, I should get to the point... The VCF museum in New Jersey has an XD88/30 on permanent loan along with its accompanying monitor, intact with original disks, but unfortunately no peripherals. Over the past year or so I've slowly worked to restore it to functionality and I have finally hit a roadblock I'm not sure I can figure out alone. We were able to slurp an intact copy of UTek V off the original hard drive before it failed, and after some power supply maintenance were able to actually boot the machine off a SCSI emulator. It appears the hardware itself is fully functional as the machine passes all diagnostics and we are even able to navigate the filesystem over serial console. But not having a keyboard means the system will not start X or do anything graphical, as it assumes it is an XD88/01 headless machine. We acquired a keyboard -- at moderate expense, they're unfortunately quite desirable to collectors for some reason -- but quickly came to the realization we were missing something else as the connectors were physically incompatible and entirely different pinouts electrically. It turns out, as mentioned in the manuals (available on the Tek wiki), the /30 (and probably /35) machines specifically use an "MIS" module inline with the keyboard to combine inputs with the optional dial box. We do not have this box and the manuals do not elaborate on if the box is "smart"/actually does anything beyond simply combine pinouts. By beeping both sides out and making up a little adapter with DuPont wires, we were able to power up the keyboard and get it receiving data from the computer enough to come out of a "lock-out" mode and start being able to transmit data of its own...but we have not yet figured out how to get the computer to recognize its keyboard and take in data to display on the screen. Without knowing if we're missing any translating logic in the MIS box, we are at a bit of a brick wall. I have some very rough pinout scribblings I can provide to try to make this less confusing, and I haven't totally exhausted adapter combinations to try...but I am putting out a plead for help! If anyone has an XD88, or worked with them in any capacity, I'd absolutely love to talk and compare notes. I threw some images of the system in an Imgur album for those interested: https://imgur.com/a/YFEbijI Once we're able to get the system booted and able to wipe potential PII I would be happy to share the disk image, since I know software for them is basically nonexistent and a handful of the surviving machines were recovered diskless. In general I am working on putting together a public page with my notes and research on the machine to hopefully help anyone who might have one. Any questions and comments are welcome! Take care, CJ R.