Re: 6522: can CAx and CBx used as inputs?

From: silverdr_at_srebrnysen.com
Date: Sun, 2 Jun 2024 20:18:49 +0000
Message-Id: <8C4866AF-BB1E-432A-831F-3ED901B7BE97_at_srebrnysen.com>
> On 2 Jun 2024, at 19:37, ruud_at_baltissen.org wrote:
> 
> Hallo allemaal,
> 
> 
> I'm reviving some old projects with their own PCBs and I need some extra inputs to read some DIP switches. I have a 6522 and its CAx and CBx pins are not used so the idea rose to use them. But I never ever used them as inputs myself before and studying the data sheets, I came to the conclusion that these these pins can only be used as inputs to generate an interrupt and cannot be read like one of the PAx or PBx pins. That would a bit of a bummer so I hope I'm wrong.
> 
> Can anybody confirm my conclusion, or better, tell me that I'm wrong?

I used them only for transfer "handshake" but I vaguely remember that (at least some of them) could be used as output. Not an input though. At least not for static input like reading flags/dip switches. Would also like to be corrected if I am wrong;-)

-- 
SD!
Received on 2024-06-02 22:00:01

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