"MPU's or other IC's are fazed out and no longer made by the manufacture. They will usually spec a replacement but it is usually not pin or software compatible. . ." OTOH, I was able to buy a kit to repair the dead display on an FT107 (also fits 901 and 902). The original display driver was a custom made chip and I can't fault Yaesu for not re-ordering a stock. Digital displays were still in their infancy around the time the 901 came out and the 107 rig 'borrowed' the design. The two display drivers I was able to buy were the result of an enterprising individuals effort with a PIC chip and a few parts. Now I have a working rig and a spare for one of the other two rigs that have the same display. Plus, if it really came down to it I have a design I can clone. My point is, as time goes by, newer hardware that comes on the market will be capable of replacing outdated electronics, IF we are up to doing the redesign. Most of the problems we experience today are the result of custom made chips - most of which can be mimicked with newer universally programmable device. The future will offer us many options we don't now have. It'll be selecomething the younger generation can eat for breakfast. Al WA6VNN
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