Added bullet-point about program listings formatting. Sections 5.4, 5.5. Corrected programs, which contained errors in the original, printed book. Did they use OCR to process dot-matrix printed listings and get the text to be pasted to the book??
corrected misspelled PRINT# occurrences
minor formatting changes, mostly to the tables
added short information about restoration of covers
fixed diagram indentation
moved to a subdirectory of its own