Re: 6522 VIA inputs

From: smf <*smf_at_null.net*> Date: Fri, 21 Apr 2017 14:48:32 +0100 Message-ID: <8161769d-0333-ed32-3f59-5c4cd19ce9f0@null.net> · smf_at_null.net

On 21/04/2017 11:11, silverdr@wfmh.org.pl wrote:
> I want to output data to VIA port pins acting as inputs and started to 
> wonder whether I should drive the lines HI (seems to work in tests but 
> if the lines are in fact pulled up then it's presumably 
> unneeded/undesirable) or rather tri-state my outputs instead.

Do whatever is easiest. The pull ups are rather weak & while they work 
when you disconnect an input, running a long wire that is tri stated 
into the chip is probably not a good idea. It's perfectly acceptable to 
ignore the pull ups and drive 0v/5v.

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