Hi everybody, haven't posted anything around here before, love the forum. I'm mostly into the C64, but got myself a nice boxed A500 from a german Ebay seller a couple of years back. It works fine with an ACA500plus, but has some sort of issue with the floppy drive. It reads disks fine. However, when I try to copy a disk, I get mixed results. Most often it seems to work fine, no errors during writing, but the resulting disk is unreadable.
A few days back I eventually got around to opening the case and checking out the drive. It seems very clean and nice, and the small caps seem to be ok, at least there's no physical signs of "bulging" or leakage. It's a Chinon. More surprisingly, I found something strange on the motherboard: The Gary chip has a resistor soldered on to two of the legs! Has anyone got any idea why this was done? Can this be related to the disk drive issue?
The motherboard is a PAL revision 6A. The only other possibly unusual thing I found, was that the Fat Agnus was version 8375, and seems to be a bit never than the other chips.