Finally got around to finishing a writeup about the NZ-920 navigation computer I got as scrap a while back.  Unfortunately wasn't able to do any real circuit tracing here due to a combination of densely-packed multi-layer boards and conformal coating, but figured out some things about it just from looking, although mysteries remain.

https://www.eevblog.com/forum/projects/avionics-reverse-engineering-honeywellsperry-nz-920-navigation-computer/