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another look at the printer mechanism. you can just barely see the copper coils (middle) that drive one of the print head pins.pic.twitter.com/ryhOOefPYm
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aaaand we have data! this is a test disk, and it's just single sided.pic.twitter.com/QvRDIIuKJa
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the drive already has a logic board but it's this weird custom HP thing that has a proprietary disk interface. time for it to go.pic.twitter.com/ALGhNYD0V7
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typically these drives use a shorting block (the black thing with the jumpers you can cut) but im using a switch bank instead. H/T
@bitsavers for this trick.pic.twitter.com/bThcUCDj0r
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ooh, it's 35 configuration jumpers. this may take a while...
pic.twitter.com/iQvNyQKyZf
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better. the SA850 has around 20 configuration jumpers. time to check the manual and make sure they're all set right.pic.twitter.com/p5oDhQ3whm
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first though a bunch of these test points had snapped off, so i gotta swap those out for fresh ones.pic.twitter.com/esktLVjlol
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this afternoon's project: replacing the logic board in my Shugart SA850 8" floppy drive. this board i got from
@theretrowagon.pic.twitter.com/1enApFnuXG
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they're surprisingly stable across a wide temperature range.
pic.twitter.com/e3TL2jjKSf
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on a scope, you can see the sine wave it creates. if you overdrive it, the reed bounces against the limits and the waveform distorts.pic.twitter.com/flCYp5Hz1P
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it's a little hard to hear so i put a plastic card to amplify itpic.twitter.com/AsRv4rPwCT
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