>>> 4-bit wide bus that real controllers can use.
>>
>> Is it easy to bit-bang this on PICs/dsPICs/PIC32s?
>
> BTW, I mentioned the multi-card reader I have has a Realtek
> RTS5161 controller inside. I'm sure I read that it's based on a
> 6502. No doubt the 5161 has fast dedicated h/w for the data
> interfacing. Perhaps the 6502 is to blink the LED ;-)
>
> Joe

That reminds me of a circuit I saw many years ago. The circuit computed
logs using a Z80. It put the Z80 in the feedback of an op amp, using it as
a diode.

Harold

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