TSV recording doesn't work with 8 bit color.

[dulsi]

The rawFrameBuffer is all 0 in 8 bit color. I coded up a fix in my fork of your simulator. I don't think you can pull it directly but here is a link:

https://github.com/dulsi/tinyscreensim/commit/0b23c9b66865c2fa7888e94df483fa7105aee903

It wouldn't be hard to copy the code into your codebase if you want.