28651Re: New 8" system works (was Lobo floppy drives)
- Dec 15, 2012--- In firstname.lastname@example.org, Mike Loewen <mloewen@...> wrote:
>Cool, so I can imagine the two sensor signals going to an RS flip flop to provide the 2S signal and as you said to an OR gate for the index.
> The double-sided drives have a 2S signal on pin 10 of the interface
> connector to indicate single or double-sided media. The outputs of the
> respective pulse-shaping ciruitry for each sensor is essentially ORed to
> form a single Index pulse output.
Hmm, thinking about why, I guess the design was to create a hardware error if a user placed a DS disk into a SS drive. As Rich found, the lack of index pulses caused a drive not ready. Correct me if I'm wrong, but in later 5.25" drives, they did not change the index sensor location. Then I suppose the errors created would be software generated?
I vaguely remember hearing a discussion about how computers switched from hardware solutions to software solutions, then back to hardware. I just don't know the dates, could this 8" to 5.25" be part of that switch?
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