I want to build a programming target board for the ATtiny45 and the ATtiny2313, following the directions on EMSL's page on target boards. This picture...




shows that both chips have the same connections except for GND. If I just go ahead and wire up my target board with GND connected to pin4 and pin10, will having a GND at pin4 cause a problem when trying to program the ATtiny2313? Should I insert a switch or jumper for disconnecting pin4 to GND, or is that unnecessary?

TIA!

I don't know the 2313 very well, but if pin 4 is an IO pin, it would probably be "okay" as long as the pin was set to input... But if you programmed it to be a high output for some application, it seems it would short when it reset after programming.

I'd suggest the jumper, just because it's simple, cheap and shouldn't affect anything else.

That should work fine.

In fact, it should work just fine in our '2313 breakout board ( http://www.evilmadscientist.com/article.php/card2313 ), once you add a wire for pin 4. The 20-pin ZIF sockets that we have even have a little ridge that indicates where to put an 8-pin chip, so you could use one ZIF-socketed target board to do both.

Thanks, karlgg and Windell!

I already have a couple of ZIF sockets I bought on eBay a while ago, so that's why I was asking. With only two, my plan is to make on for the mega series and one for the tiny series. Now, with your guys' help, I'm ready to go!

Thanks again!