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26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
[DEF SEG](DEF-SEG) is used to define the area in memory to access QB64's emulated conventional memory.
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## Legacy Support
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* **QB64 implements memory access using [_MEM](_MEM) and related functions. For that reason, [DEF SEG](DEF-SEG) isn't recommended practice anymore and is supported to maintain compatibility with legacy code.**
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## Syntax
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> [DEF SEG](DEF-SEG) [=][{segment|VARSEG(variable}]
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## Description
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* Used to set the pointer to a memory area of a variable/array or register.
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* [PEEK](PEEK) and [POKE](POKE) require a segment memory address (often just 0) without using VARSEG.
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* Important segments using [PEEK](PEEK) and [POKE](POKE) include &HB800 (text segment) and &HA000 (graphics segment).
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* [BSAVE](BSAVE) and [BLOAD](BLOAD) require a VARSEG reference to the grahic array(0 index) used.
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* Always use DEF SEG when the procedure is completed, in order to reset the segment to QBasic's default value.
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* [DEF SEG](DEF-SEG), [VARSEG](VARSEG), [VARPTR](VARPTR), [PEEK](PEEK) and [POKE](POKE) access QB64's emulated 16 bit conventional memory block. **It is highly recommended to use QB64's [_MEM](_MEM) memory system to avoid running out of memory.**
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## See Also
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* [DEF SEG = 0](DEF-SEG-=-0)
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* [VARPTR](VARPTR), [VARSEG](VARSEG)
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* [PEEK](PEEK), [POKE](POKE)
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* [BSAVE](BSAVE), [BLOAD](BLOAD)
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