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Jeri Reverse Engineers an HC55564 Chip from an Old Pinball Machine

Jeri Reverse Engineers an HC55564 Chip from an Old Pinball Machine

In her latest Intersil “Academy of Analog Pinball Wizardry” video, Jeri Ellsworth replaces an HC55564 Continuous Variable Slope Delta (CVSD) codec chip with one she reversed engineered into an FPGA. What in blue-blazes is a CVSD modulator? Watch the vid and find out — as usual, Jeri does a great job of showing how it works, how she reversed engineered it, and what the result are.