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In case you're curious: the unexpanded VIC-20 has a total of 5.5K RAM, of which 1K is used for system memory, 0.5K is used for colour memory and 0.5K is used for screen matrix (video memory). It leaves an effective 3.5K for your own programs. In machine code, you might be able to nibble a little of that 1K system memory for your own uses. There are a few smaller chunks of unused space there, that can be filled with POKE from BASIC too which many BASIC programs did to place short machine code routines outside of general program space.

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