42 lines
1.5 KiB
Text
42 lines
1.5 KiB
Text
# Advanced Builds
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## Reduced Memory
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RETRO can be built for reduced memory targets. This is primarily
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intendeded for use with embedded targets, but can be useful on
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large machines as well.
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To do this, `make` with `CFLAGS` set to `-DMEM1024K`, `-DMEM512K`,
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`-DMEM256K`, `-DMEM192K`, `-DMEM128K`' or `-DMEM96K`. These will
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target memory sizes as specified per the following table.
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| | 1024kB | 512kB | 256kB | 192kB | 128kB | 96kB |
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| ------------- | --------- | ------- | ------- | ------- | ------- | ------ |
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| Total Bytes | 1,048,579 | 524,288 | 262,144 | 196,608 | 131,072 | 98,304 |
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| Image | 968,000 | 384,000 | 192,000 | 126,000 | 96,000 | 72,000 |
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| Data Stack | 512 | 512 | 512 | 512 | 512 | 512 |
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| Address Stack | 1,024 | 1,024 | 1,024 | 1,024 | 1,024 | 1,024 |
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| Remaining | 79,040 | 138,752 | 68,608 | 69,072 | 33,536 | 24,768 |
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The remaining memory is available for use by the VM.
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## Custom Image
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For users of BSD, Linux, macOS, you can customize the image at
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build time.
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In the top level directory is a `package` directory containing
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a file named `list`. You can add files to compile into your
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system by adding them to the `list` and rebuilding.
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Example:
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If you have wanted to include the NumbersWithoutPrefixes.forth
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example, add:
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~~~
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'example/NumbersWithoutPrefixes.forth include
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~~~
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To the start of the `list` file and then run `make` again. The
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newly built `bin/retro` will now include your additions.
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