>> Forgive my ignorance, and TBH the amount of material available
>> for the USB newbie is bewildering, but is it not possible to bit-
>> bang USB ? That's not to say I would do that if another option is
>> available, such as alternate memory, but it seems most protocols
>> have both hardware and software (ie bit-banging) solutions. Is
>> that not the case for USB ?
>
>As I understand, USB is a lot more complicated then,
>say, I2C, SPI or USART communication.

Yes, but the project I referred to used bit-banging on an AVR as a client 
device. I imagine the maximum speed was 1.5MB. See 
http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm 

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