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In page VIC-20:
"Most expansion cartridges featured hardware DIP switches, allowing the RAM to be enabled in user-selectable memory blocks. Since the VIC-20 was designed to use SRAM rather than DRAM, the system board has no provisions for DRAM refresh. RAM expansion cartridges ultimately allowed adding up to 24 KB to the BASIC user memory; together with the 3.5 KB built-in user memory, this gave a maximum of 27.5 KB for BASIC programs and variables. Memory not visible to BASIC could still be used by machine code programs.[citation needed]
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