Discussions on more advanced topics such as monolithic vs micro-kernels, transactional memory models, and paging vs segmentation should go here. Use this forum to expand and improve the wiki!
Sorry, I forgot an important system!
the UZI family of OS is for Zilog CPU and is a small
system that is mostly V7 compatible but has a limitation that
a file can only be up to 64kb.The best to look at would be UZI180
for Z180 singleboard computers or UZIX 1.0 for MSX machines.
UZI contains no UNIX code but some parts are similar to unix
and other are very simplified.UZI is written in C but would need
much work to adapt it to 32bit PC,because its code in some parts uses very simple algorithms, simpler than V7.