First I wanted to try a breadboard.

that may be your problem. with today's fast risetimes breadboards seem to create more problems than the use is worth.

two more for the priorituies:

make a thread you have visited earlier go unread when sonmeone add a post.

get the 'viewed marking movbed to the server, it is annoying to have to 'update the cookie' evry time youn switch device

one more for the priorituies:

make a thread you have visited earlier go unread when sonmeone add a post

you ARE in mismatch, changing another bit does not create a 'new' mismatch.

whenever you see a mismatch, you need to make whatever the pins are the new 'match' to see a mismatch

is that clearer?

you ARE in mismatch, changing another bit does not create a 'new' mismatch.

whenever you see a mismatch, noy need to make whatever the pins are the new 'match' to see a mismatch

is that clearer?

what you are saying makes no sense.

port match can not happen if "but remain in 1" since you  already have a mismatch

8051f5xx

besides the name, there is no big difference between EFM8... and SiLabs f3xx - up,

8051f5xx

besides the name, there is no big difference between EFM8... and SiLabs 8051F...