>> Why not roll your own? I'd do it with a 3.3V i2c  RAM device, like a
>> MC24C00. This can be done in SOT23-6
>>  so would fit into a VERY tiny potted parallel port. ...
>>
>Oops, you wanted USB dongles. Sorry.

However that doesn't mean it couldn't be implemented with an FT245 type 
chip, or one of their later ones which ISTR can be configured with an I2C or 
SPI interface instead of parallel. 

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