I recently got an Atari 800xl rev D, now the computer booted fine after a few reseats of the RAM and etc, but with cold reboot it boots in the diag menu and a warm reboot it gets to the "ready" stage. so i went in the schematics and saw the 3 button outputs does not go to the porkey but to the GTIA pin 12 13 and 14 and sound comes from pin 15 witch are labeled S0 to S3. When i measure on those pins i get just a few millivolt, 124 mV as maximum.
My questions are:
*Does these pins get to be pulled up by the GTIA itself or do i miss some other pullup?
*can i order a new GTIA or is there hope for this one?