it’s a floppy driver! its a parallel port! it’s an irda transceiver! its the LPC47B272 100 Pin Enhanced Super I/O Controller with LPC Interface!


we bumbled onto this chip while googlin’ some floppy stuff. it’s amazing what is still in stock for purchase, even during a silicon shortage. we can’t get n-channel power mosfets but we can get a LPC47B272 “100 Pin Enhanced Super I/O Controller with LPC Interface” – it comes with TWO 2.88MB super i/o floppy disk controllers, TWO serial ports, IrDA, a parallel port, and a keyboard controller, ok? and there are 3000 in stock at, so, like, what else do you want!? we sorta imagine this poor creature on a PC/104 board, desperately checking the IrDA irq… doin’ its very best but wondering why it doesn’t have any friends who visit anymore. anyone want to wire one of these up to raspberry pi?

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  1. It does seem like you should be able to make the PIOs on a 2040 speak LPC.

  2. scatterbrained2

    These things are a bit of nightmare to program – tons of levels of page/index registers to get to the bytes you want. The LPC bus isn’t that complicated, but bit-banging it would be slow. I think Winbond still makes a couple of these as well. This particular part is probably a holdover from the Microchip SMC/SMSC acquisition.

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