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The C128 has twice the RAM of the C64, a far higher proportion of which is available for BASIC programming, due to the new MMU bank-switching chip. This allows BASIC program code to be stored separately from variables, greatly enhancing the machine's ability to handle complex programs, speeding garbage collection and easing debugging for the programmer. An executing program can be STOPped, its code edited, variable values inspected or altered in direct mode, and program execution resumed with the variable table intact using BASIC's GOTO command.^[6] Although other BASICs support the CONT command to restart execution without clearing variables, editing any code causes them to be cleared.^[7] Different memory configurations can be loaded using BASIC's BANK command.^{[citation needed]}