I've been up to my eyeballs in IBM 51xx machines and associated peripherals for the past few days, cleaning, repairing and sorting parts to see what I can permanently resurrect. Lots of shorted tantalum capacitors, smoked mains filter caps, faulty RAM, seized drives, vsync/hold/vsize issues, the list goes on. One step forward, two steps back with these machines, taking a lot longer than I'd anticipated. So far I've managed to clean up and restore 2 x 5151's, 3 x Model F XT's, 1 x Model F AT, 3 x Tandon TM 100-2A, 1 x Type 13 20MB MFM, 2 x 5160 motherboards. Still have another 5151 with issues, a 5154 that has failed previous repair attempts, 2 x 5150 motherboards with what appears to be faulty RAM, 3 x Tandon TM 100-2A's that have shorts somewhere on the controller boards, an AST MegaPlus II with a short, another sick MFM drive and a 5153 I haven't gotten to yet!