Hi,
I was not sure if I should put this topic under Emulators or Development.
But I think it fits more into development:
There is a new version in beta (3.5.0-rc2) for the DeZog vscode Z80 debug adapter.
It is dedicated to ZX81 development and comes with an internal simulator of the ZX81 especially the ZX81 ULA display
with support for hires graphic modes (wrx, arx, chr$64/128). Additionally there is also chroma 81 support.
Any feedback is appreciated, errors, improvement request, etc. Of course, also if it works for you.
Please give it a try, you find it here:
https://github.com/maziac/DeZog/releases
DeZog is mainly for Z80 assembly development and debugging.
An example how to setup an assembler program with p-file generation and BASIC wrapper can be found here:
https://github.com/maziac/zx81-sample-program