The Commodore Years - Hardware - VIC20 Expansion
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The VIC 20 had only 3.5kb memory available to the user. This could be increased by adding memory cartridges. These came in 3kb, 8kb and 16kb versions. There were also switchable cartridges that avoided the need to remove them when only the lowest memory was needed. A problem arose because adding memory forced the computer to move its own memory so that a program written without expansion might not run with additional memory installed. Memory could be reconfigured within software. An alternative was to use a motherboard, a piece of hardware which could hold several cartridges. By moving the switches on the motherboard, different memory configurations could be selected.
   
No expansion - 3583 bytes free  
3k expansion - 6655 bytes free  
8k expansion - 11775 bytes free  
16k expansion - 19967 bytes free  
A large amount of software was also available on cartridge. This automatically configured the necessary memory.
Stack four slot switchable motherboard for VIC 20.
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