Technical Concept
Toolkits ran as terminate and stay resident extensions to the BASIC interpreter supplied with the machine. At the time, such interpreters almost always came programmed into the ROM of the computer, making it impossible to modify or patch the code. It was also extremely rare for manufacturers to offer upgrades or bugfixes except as part of new models of machine.
As the original language was held in immutable ROM, it generally was difficult for a toolkit to directly extend the language, except by adding new keywords to perform functions not implemented by the original interpreter.
Read more about this topic: BASIC Extension
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