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Re: Connecting IO to the devel boards
Johan Adolfsson wrote:
> Perhaps you can use one of the parallel ports as an
> "address bus" to select a group of 8 I/O and the other as
> "data bus" ?
> (Every "address" must select either input or output pins)
that is the possibility I want to use.
I can even use the parallel port in EPP mode, that way I can use my
'extension' board on a normal parallel port to.
Can I use 'normal' 5V TTL logic or do I have to use 3.3V logic ?
(8255 from Intel are 5V only I guess . Other alternatives ? )
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