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The code is a bit difficult to understand, but it represents the 'normal' path for processing a DECtape word. The code always flows all the way to the break. For start of block, there's extra code to check for a timing error; but then the first word is processed (case 0). For a normal word, a 3-cycle data break is done - increment word count and current address, check for word count overflow, put the word in the buffer; but then check for end of block (case DTO_WCO). If the word count has already overflowed, just check for end of block. So yes, the end of case 0 should be labeled 'fall through' as well. FNC_WRIT has the same structure and needs the same comment.