![]() ![]() You would need to then speak MMC commands, and finally implement a file system (unless you want to treat the card as a raw block store). Here you are basically just bit-banging a slightly odd SPI peripheral. This comes closest to your original idea of using a USB-to-Parallel cable, but with hardware actually intended to work in the reverse direction as you require, which as others have explained is something those limited purpose cables cannot do.Ī much cleaner option would be to replace the USB flash drive with an SD card which you could operate in legacy MMC-SPI mode (and which modern systems can use via a USB card adapter). 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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