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Windows 95 almost had floppy insertion detection but the training cost was prohibitive
Is this a late April Fool's joke?
Windows 95 almost had floppy insertion detection but the training cost was prohibitive (posted April 02, 2009 7:00 AM): http://blogs.msdn.com/oldnewthing/ar...2/9528175.aspx http://tech.slashdot.org/article.pl?...17242&from=rss AFAICT, all you need to do is to look for an active DISKCHANGE signal. A single STEP signal, presumably toward TRACK0, will clear it. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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Windows 95 almost had floppy insertion detection but the training cost was prohibitive
Franc Zabkar wrote in
: Is this a late April Fool's joke? Windows 95 almost had floppy insertion detection but the training cost was prohibitive (posted April 02, 2009 7:00 AM): http://blogs.msdn.com/oldnewthing/ar...2/9528175.aspx http://tech.slashdot.org/article.pl?...17242&from=rss AFAICT, all you need to do is to look for an active DISKCHANGE signal. A single STEP signal, presumably toward TRACK0, will clear it. - Franc Zabkar That's interesting. I had always assumed that apple's had smarter floppy hardware, heh. I think this post from /. user Jamie's Nightmare sums it up well: You're a bit out of focus here. It worked well on the Mac and the Amiga because the floppy drives themselves were different. The hardware was designed to signal the machine when a disk was inserted via a switch/sensor inside the drive that was depressed when the disk was inserted. Similar, but in a different location than the "write protect" and "high density" sensors. This method is simple and it works. The only real point of failure is the possibility of the switch going bad, but I can't say that I've ever seen that personally. The method from Microsoft was a way to do the same thing in a way that wouldn't always work. Do you remember Floppy Drives? Remember how cheap and ****ty they were? They were not very reliable to begin with, and it's likely that even if it worked before there might still be mysterious times when a disk was inserted and this method wouldn't work. Microsoft made a good choice here, but rather than acknowledge that you'll just bitch more and fish more crap from the excuse box. That comment is the copyright of the poster, yada yada yada. __ |
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Windows 95 almost had floppy insertion detection but the training cost was prohibitive
On Sun, 05 Apr 2009 15:45:14 GMT, Justin Goldberg
put finger to keyboard and composed: Franc Zabkar wrote in : Is this a late April Fool's joke? Windows 95 almost had floppy insertion detection but the training cost was prohibitive (posted April 02, 2009 7:00 AM): http://blogs.msdn.com/oldnewthing/ar...2/9528175.aspx http://tech.slashdot.org/article.pl?...17242&from=rss AFAICT, all you need to do is to look for an active DISKCHANGE signal. A single STEP signal, presumably toward TRACK0, will clear it. - Franc Zabkar That's interesting. I had always assumed that apple's had smarter floppy hardware, heh. I think this post from /. user Jamie's Nightmare sums it up well: You're a bit out of focus here. It worked well on the Mac and the Amiga because the floppy drives themselves were different. The hardware was designed to signal the machine when a disk was inserted via a switch/sensor inside the drive that was depressed when the disk was inserted. Similar, but in a different location than the "write protect" and "high density" sensors. This method is simple and it works. The only real point of failure is the possibility of the switch going bad, but I can't say that I've ever seen that personally. The "high capacity diskette drive" that shipped with the original IBM PC/AT had an optical media sensor that signalled the controller via a DISKCHANGE pin on the interface. When the user inserted a diskette, a flip-flop would be set. A STEP pulse from the controller would reset the flip-flop. The double sided 5.25" diskette drive had no such sensor or interface signal. However, we are talking about a 1995 OS, not DOS, so presumably we would be focusing on 3.5" drives. AFAIK, the only difference between Amiga and PC drives was in the READY and DISKCHANGE signals. The PC didn't use the READY signal, and the DISKCHANGE signal was on a different pin. Some time ago I built an adapter circuit to convert a PC drive for use in an Amiga: http://groups.google.com/group/comp....f?dmode=source - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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