IBM 5160 oddball fault

On 04/23/2015 04:55 PM, Jules Richardson wrote: Aha! I'd tried it in slot six (originally it was in seven) with the same result, and then I gave it a go in slot five too, just to confirm that it wasn't 'luck' that two slots were bad - the problem remained. Now while I had the system board out of the machine (as it makes it easier to poke around the bus signals without a riser card / extender), I figured I'd try the other slots just to verify that they were all bad. Well, it worked in slots 2 and 3 (I didn't try 1 as I've got a hazy memory telling me there's something different about that one), but was failing in slots 4 and up. There was no visible damage to the PCB, but checking with a meter showed there to be a break in continuity on A11 between slots 3 and 4, so I've now bridged them with a wire, and all is now working OK :-) cheers, Jules Checking with a meter, it seems that I've got a break in the PCB track for A11 between slots three and four. There's no visible damage