Well these modes are available both in the current version and previous versions, there was not any bug.

But you need to check some settings for them to work:

- enable "New G.Modes" setting on ZX Uno Bios

- enable real video and ulaplus on Settings->Display menu on ZEsarUX

Check some of the demo programs at https://github.com/chernandezba/zesa.../ZEsarUX_modes


About Prism mode, is a 256x192 mode, 1 colour for every pixel. It's based on one of the different modes that the ZX Prism clone has (http://zxprism.blogspot.com)

Cheers