heuser.marcus@freenet.de wrote:
On Aug 30, 8:42 am, Drew <GoggleD...@gmail.com> wrote:Well on the back of my 2 x 1.0.1 boards there is a capacitor...maybe thats the difference. Anyone confirm if there is a capacitor on the back of the 1.0.2 board?I don't have the card but a photo of the 1.02 backside and it doesn't have a capacitor there. Judging by ebay auctions the 1.02 seems to be much more common than the 1.01.
If the capacitor is a small value (less than 0.01uF), then it is used to slow down a signal that was most likely creating a "race" condition on some cards. If the capacitor is 0.01uF or bigger, then it is a bypass cap that was installed to solve a power glitch problem. Either way, the 1.02 version apparently altered the logic in the gate array to eliminate the need for the cap--and possibly in a way that lowered the average upper limit on card speed. (This suggests that the cap is probably a small cap, and a race condition was the problem it was fixing.) -michael AppleCrate II: An Apple II "blade server"! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."