VIC-2407 RealTime Clock + 35KB Expansion Cartridge

Commodore VIC-20 cartridge combining a battery-backed RTC and 35KB RAM expansion

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This cartridge adds a battery-backed real-time clock and 35KB of RAM expansion to a Commodore VIC-20 in one combined unit, with configuration switches and the ability to hot-unmap the RTC when the expansion port is needed for something else. It's for VIC-20 collectors who want more memory and persistent timekeeping on a machine that originally had neither.

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