> For $300.
I found my "Commodore 64 Machine Language for Absolute Beginners" manual today. I had thought I'd only gotten the Assembly one (which I haven't dug out of storage yet). Along with it was a sheet of paper where I was playing with (then) undocumented registers, DEC'ing them and noting the results. It probably had something to do with printing graphics on my dot matrix printer, since the most complex (and monitor destroying) thing I did was that drawing program for cassette case inserts. Also, my 1571 drive....