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Atari Portfolio Capacitor Replacement Guide
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== Overview == The Atari Portfolio's main board is a compact single-board design containing the Intel 80C88 CPU, RAM, ROM, and all support circuitry. The board uses a mix of '''SMD (surface-mount) and through-hole''' electrolytic and ceramic capacitors. The primary areas where capacitor failure causes issues are: * '''Power regulation''' โ Input filtering and voltage regulation for the 5V logic supply * '''LCD bias generator''' โ A small charge pump/DC-DC inverter circuit generates the negative voltage (~-15V to -20V) required to drive the LCD * '''Memory backup''' โ A capacitor (or supercapacitor) that maintains RAM contents during battery changes * '''Decoupling''' โ Standard ceramic decoupling capacitors near the CPU and support ICs
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