add 22 bit OSs

[zzsczz]

Is there any technical problem to add 22 bit OSs support for running 2.11bsd ?

[Isysxp]

Hi, yes. The app does not do split I/D space addressing which is required for BSD2.11. I assume you have tried the Ultrix image
which is very similar to BSD and is the last of the non split I/D space versions of Unix. To run BSD2.11 you need the spritetm build for the Wrover kit https://github.com/Isysxp/esppdp which is based on Simh. This is an ESP-IDF app and could be fixed to run on the M5Core2 instead. Not surprisingly, Simh struggles a bit on the ESP32 as it is a very complex app. In the meanwhile, I have decided to draw a line with this app as it runs most of the good old PDP11 OSs which was the primary target. To this end, I have added some more OS images to the images directory for you to try.