Hi I love your website, have been a long time lurker, I had a System 80 back in he 80's which served me very well. It was well kited out having an internal expansion (floppy/printer) board produced by John Gilbert in Auckland, hard to find information on tis board, I wish I had kept it.

One bit of errata on the following page, under the section 2.3

/system-80/hardware_s80.htm

You really need a dot point to highlight the fact the expansion connecter was not compatible with the TRS-80 (I think is mentioned elsewhere), but it was significant difference (deserves a bullet) because you could only get accessories specifically designed for the machine, TRS-80 ones wouldn't work. I think there may have been an adapter board but I don't know that for certain.