Or of course Honda for a new one...............part number is 30405-KV3-306 (thats c/w card by the look of it....) they were £350 in the 90's in Japan

I've never seen one on Ebay, Apex did have one in, they wanted a lot for it (around £400 I think).
So double check and make sure it's the PGM.......
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Please do not PM me technical questions, if you can't find it on the Forum start a thread