I've noticed in one particular ANTIC chip of mine (NTSC) seemed to have occasional subtle pixel flickering issues on some applications & games.. Was never really able to pinpoint it, until I happened to try "Encounter!" which presents the glitchiness prominently.
This ANTIC chip behaves exactly the same in different machines, even with socket replacement. (Which I was doing anyway in preparation for tf_hh's 512KB SRAM board) Done a lot of chip swapping between the machines, so I'm not sure exactly which machine it was originally in now (one of 1 600XL, or 2 800XLs)
Anyone else seen an ANTIC chip behave this way? Is it at all common? I presume there's nothing that can be done to 'fix' it other that replacing it, but I'm curious what specific graphics mode / trick is triggering it.