The Commodore Years - Hardware - 64 Expansion
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While the memory of the Commodore 64 could not be expanded there were ways of adding to its capabilities.
One was to use the memory and software of the 1541 disk drive. Another was to buy software on a cartridge. Continually inserting and removing cartridges could damage the contacts on the cartridge slot but this could be avoided by using a switchable motherboard. The four slot Stack motherboard illustrated is an example of this method.
Cartridges included extensions to the limited Basic 2.0 supplied with the 64. The one that I used the most was the Zoom assembler, there being no machine code monitor, assembler or disassembler native to the computer.
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