This is the most awesome demo I've ever seen. You may have heard that the Commodore 64 had a second CPU in its disk drive. But you've probably never seen anyone prove it quite like this:https://www.youtube.com/watch?v=zprSxCMlECA …
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The disk drive had to physically control the read/write mechanism (read bits off the floppy, eun error correction etc) AND run the comms protocol to the host. The host only needed to run the protocol. Both were basically maxed out

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Well, the Apple II did faster disk access with no CPU in the disk drive, so I'm not sure that's completely correct. It did completely max out the main CPU during disk access, and it did have a very clever state machine in ROM. Also, no disk sharing between machines.
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