KA630/650/655 TOY Battery Replacement Board

Overview

This little project solved the annoying re-setting of the time and date and console language preference every time I powered up my MicroVAX II’s (and III’s).

The old 180mAH NiCad battery pack (DEC p/n 12-19245-01) is hard to come by, slow to charge, and memory effect, ugly leaks and old age made it useless on all my MicroVAX computers.

Please note: this revision A design does not offer protection against battery over-discharge. See the newer Revision B post. Continue reading “KA630/650/655 TOY Battery Replacement Board”