[reaperducer]

Wow, this is triggering some kind of memory cascade in the back of my brain that I simply cannot place. I know this font, but I really can't say from where.

The closest guesses I can come up with is the Commodore 64 Programmers Reference Guide, or maybe an old terminal or computer magazine. But I could easily be wrong.

Either way, I love it.

[aaronharder]

Perhaps Forrest Mims of Radio Shack Engineer's Notebook fame?

https://hackaday.com/2017/01/18/forrest-mims-radio-shack-and...

[reaperducer]

Wow. I think that might be it!

[blattimwind]

This kind of writing seems to be the equivalent of Normschrift in the US; it's all over schematics from the 60s and 70s (sometimes even the 80s). Just like Normschrift written by craftsmen it looks super-regular, almost like computer set type, except it has tiny variations between draftsmen, making it clear it is actually written by hand. (Some people use templates to write Normschrift; a looked down upon practice, generally not permissible in exams).

[bitwize]

To me it looks like the Simplex font from AutoCAD (which I believe was based on a selection of characters from Hershey).