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atsuko

til external floppy connectors on pc9821 laptops have different pinouts despite the same physical connector

also, the power connectors are almost the same but subtly different :<

tl;dr those floppy connectors differ ever so slightly between 98NOTE AILE and 98NOTE LIGHT: on one the /DRIVESELECT is PIN3, and +5 is PIN4, and on the other it’s swapped (plus some small changes) :<

wanna make unnecessary smart adapter board that changes behaviour based on which pin is going down for /DS0

@yottatsa
Isn't sending 5v how you select the drive?

@EndlessMason no, it’s other way around: all the logical signals in floppy disk ribbon are active low

@yottatsa
Sounds like a connector conspiracy type situation

@EndlessMason because you need more chargers!