The bars above RESET and SS are supposed to be there, they represent the fact that the signal is active low rather than active high. Sumatra renders them properly now.

I went exactly the same way as you. Escape from the bloatware and security-hole Adobe Acrobat Reader to try FoxIt PDF. I appreciated the annotation capability, but the text quality was much too bad.

Finally I settled with PDF XChange Viewer. To my opinion it’s simply the best, too bad it’s not available on Linux. Annotation is much better, and rendering quality is “almost” on par with Adobe.

What reader are you using now?

Also, did you noticed that FoxIt added lines on top of “RESET” and “SS”, but not others? Is that a bug in the other readers?

No PDF reader seems to be quite as good as Adobe’s for rendering quality, and even that isn’t quite as good as Windows when it comes to fonts.

Windows with Cleartype is one of the few renderers which is designed to be readable on screen at the expense of accuracy. Fonts don’t look quite how they do in print on screen, but they are easier to read on an LCD.

I suppose the whole point of PDF is to display a document exactly as it prints, but some lack of accuracy in exchange for extra on-screen readability is a reasonable compromise in my eyes (no pun intended).