I've started looking at what it's going to take to get the memory in the Imlac running again. There are two core assemblies in this machineand they're both in pretty bad shape as they were exposed to moisture for a long enough period that they accumulated quite a bitof corrosion on the control logic. (The cores themselves seem to be OK). I went over the better of the two assembliesand cleaned the legs of every socketed IC. In the course of doing so I found maybe 10 chips with legs that were falling off. I took alook at a random sampling of chips from the worse of the two assemblies and every single one of them has legs that are corroded through. So I'm going to be replacing a lot of chipsif I want to get these running again. Most of these are 7400-series logicand aren't hard to find. However, there a set of components that I'm not too familiar withand I'm not having much luck finding replacements. Now that I have the schematic I at least know what they are(had no luck looking them up based on the labels on the chips), they're described as "Transformer, 60uH", "Transformer, 6uH" and "Transformer, Square Loop" and have part numbers of 517A0024, 517A0023, and 517A0021. The chips themselves that are in my machine are labeled as follows (for the 60uH variant): 14201 NPIPA-2581 <date code> These are in 16-pin DIP packages. I'm going to need to replace quite a few of them. Any ideas of a modern replacement? (Any idea where to source NOS or used ones?) I can provide pictures if that'll help. Thanks, Josh

I've started looking at what it's going to take to get the memory in the Imlac running again. There are two core assemblies in this machineand they're both in pretty bad shape as they were exposed to moisture for a long enough period that they accumulated quite a bitof corrosion on the control logic. (The cores themselves seem to be OK). I went over the better of the two assembliesand cleaned the legs of every socketed IC. In the course of doing so I found maybe 10 chips with legs that were falling off. I took alook at a random sampling of chips from the worse of the two assemblies and every single one of them has legs that are corroded through. So I'm going to be replacing a lot of chipsif I want to get these running again. Most of these are 7400-series logicand aren't hard to find. However, there a set of components that I'm not too familiar withand I'm not having much luck finding replacements. Now that I have the schematic I at least know what they are(had no luck looking them up based on the labels on the chips), they're described as "Transformer, 60uH", "Transformer, 6uH" and "Transformer, Square Loop" and have part numbers of 517A0024, 517A0023, and 517A0021. The chips themselves that are in my machine are labeled as follows (for the 60uH variant): 14201 NPIPA-2581 <date code> These are in 16-pin DIP packages. I'm going to need to replace quite a few of them. Any ideas of a modern replacement? (Any idea where to source NOS or used ones?) I can provide pictures if that'll help.