You would then need to bit-bang SPI using four or so pins of the parallel port's data word, and have software to operate the bridge chip to perform USB mass storage operations, and finally you'd have to implement a file system. Both the hardware options require that you can manipulate individual bits in the parallel port, and not merely send synchronous words to a printer.įirst, you could get an SPI to USB Host bridge, probably most practically one sold as an add-on sold for Arduino boards. There's an awkward solution to your real problem, a clean one, and a software one. I wanted to find a way to make it talk to a USB flash device, but as pointed out in the comments and answers, it's just not possible to drive the parallel port signals to control the USB device. I have a 1979 Exidy Sorcerer 8 bit computer with a parallel port.
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