Description
A common failure with the Jupiter 4 are the Mask ROM CPU Chips. Unfortunately because these Mask ROM CPUs have the firmware on the chip, you can’t just pop in a generic MCS-48 (8048) CPU chip and be up and running. This replacement chip is a drop in CPU replacement with the Key Assigner firmware on board. All JP-4 owners would be wise to keep one of these on hand as part of a “Survival Kit”.
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