Re: Interesting C64/6526 case

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Fri, 26 Oct 2018 16:17:27 +0200 Message-ID: <CAESs-_yf-tLWzqb-oguT47=kdSz5WXTFDCBsNY6DJwM-RwasoQ@mail.gmail.com> · francesco.messineo_at_gmail.com

On Fri, Oct 26, 2018 at 4:13 PM <silverdr@wfmh.org.pl> wrote:
>
>
> > On 2018-10-26, at 15:55, Francesco Messineo <francesco.messineo@gmail.com> wrote:
> >
> > On Fri, Oct 26, 2018 at 3:49 PM <silverdr@wfmh.org.pl> wrote:
> >>

>
> Those lines have to drive 1 and 2 inputs only so that would mean that those inputs are more "stiff" in some way.

well, on U1 position, usually you drive one input whenever a key is
pressed, so it works with no loads most of the time.
On the 1571, portA and portB of the 6526 are disconnected. Only the
serial port is used (2 pins).

Frank