I find the drawing tool included in OpenOffice makes good block diagrams - especially as it's free!

I agree :) One of my friends who needed to draw complicated block diagrams for his master's thesis was pulling his hair out trying to get several different block diagram programs to work correctly ...

I've been using JavE to draw ASCII art / "graphics" for this article on the HP Museum forums and I must say that JavE has a very nice UI and is easy to use.

jdb2

Good plan - I like a bit of ASCII art. We had a thread collecting suitable tools:
http://forum.6502.org/viewtopic.php?f=1&t=3109

Thanks for the link :)

A day or so ago I performed a major rework / edit on the article to fix style issues and to make it clearer and more understandable guided by ...

Oh, welcome! And thanks for writing and publishing your document.

Diagrams certainly help me!

You're certainly welcome! :D

I'll probably add ASCII art diagrams first as I'm unfamiliar with Inkscape which I'm using to draw the graphical diagrams and I'm pulling my hair out over things not going ...

Hello :) I'm the author of the referenced article. It's currently only in draft form and I've been updating and editing it to make it clearer and more understandable. If there's any ambiguity, mistakes or anything that causes confusion or isn't clear enough, please let me know :)

I next plan on ...