I had 3 A1200... all where 1D4... never faced a problem with them! I tried bppc/1260/1230/Apolo1230/Mtec030/zorroIV busboard/mediatorZIV/rbm zorroII/FastATA/bvision/grex1200 and various rtg cards... I never had issues! and I never did any fixes on them...
try the bppc on another A1200, it could be toast...
