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→PEEKs, POKEs, and user functions: more accurate statement, MBASIC programs that didn't use machine-specific functions were easily portable between machines |
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For more complex operations, MBASIC allowed user-defined functions that could be called from a BASIC program. These were typically placed in a reserved area of memory, or POKEd into string constants, as a series of [[Machine language|machine codes]] (op codes). MBASIC also provided hardware <code>INP</code> and <code>OUT</code> instructions that read and wrote directly to the 8080 hardware input/output ports. This could be used to control peripheral devices, though on at least one common CP/M system, the Osborne 1, all I/O instructions were pre-empted for use by the system.
== Successors to MBASIC ==
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