There's very little on the internet about those "NCR Towers."
> 1987: https://www.techmonitor.ai/hardware/ncr_marries_its_tower_un...: "Despite abandoning its effort to implement Unix on its NCR 32 chip set, NCR Corp did not abandon its ambition to bring Unix into the mainstream of its mainframe product offerings, and the company yesterday launched a facility whereby its top-end multiprocessor Series 9800 fault-tolerant mainframes can be used as servers to a network of 68020-based Tower Unix supermicros."
> 1988: https://www.techmonitor.ai/hardware/ncr_renews_its_tower_uni...: "When you sell as many machines as NCR does with the Tower, you can’t rush to incorporate a new chip as soon as it arrives because there simply aren’t enough chips to meet your needs. Accordingly the new Tower models use the 25MHz 68020 rather than the 68030."
Had fun porting sortware across, a radio system that was unable to test fully unless in the field (which it did first time, which was amazing). Had many good chats with HP engineers back then (we did a large purchase as a global company) and one I still recall was early editions of HP-UX having an error code of 8008, until somebody in senior managment at HP saw it one time (no customer had ever complained apparently about it).
I liked HP-UX having previously worked on IBM RT systems running AIX, as well as NCR towers with there more vanilla System V. Though did have SMIT with AIX and SAM with HP-UX for those manual saving moments of ease to fall back on. Though my favourite flabour of unix of that time would be the Pyramid systems dual universe OSx. You could have a BSD or an AT&T enviroment at once, able to use both flavours in scripts by prefixing with bsd or att, to run that command. Don't recall how it handled TERMCAP/TERMINFO of hand (that was always an area of fun back then).
Fun times, in the days in which O'Reilly and magazines like Byte or Unix World, were the internet, along with expensive training courses and manuals that you would use and thumb every page of the multi tombed encyclopedic stack they came in.
Best C platform for developing that I did use in that era, hands down the VAX under DCL, the profilers etc, pure leaps and joy.