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Earlier quoted context omitted.
Actually, the hardware bug was in the VIC-20's 6522 VIA; the CIA 6526 shift register fixes the bug. The (chief) problem on the 64 was the VIC-II stealing processor cycles.
The CIA 6526 shift register on the C64 is not used . Because the trace on the pcb that connected to it was accidentally cut by the board partner, and Tramiel was unwilling to take the time needed for the rework. C64 uses the same very slow bit-banging method as VIC-20.
I was just a little kid then, and the C64 was a neat micro, but today I can see some questionable things about their comparison matrix in the ad. Obviously, they are comparing to only the high-end competitors (e.g., Atari 800 but not the 400, and no TI 99/4A which also used their own chips like Commodore touted as a selling point, nor the TRS-80 Color Computer that was intended for home use unlike the Model III busin…
Paperclip (word processor) had an 80 column preview mode, which showed your text in hi-res 80 columns. It seemed like magic at the time and made ten year old me feel like I was performing serious business.