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97 lines
2.5 KiB
Markdown
97 lines
2.5 KiB
Markdown
# Apple IIgs Memory Map Tests
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## Sample test:
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{
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"hires": false,
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"lcw": false,
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"80store": true,
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"shadow": 12,
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"state": 183,
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"read": [
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[0, 192, 256, 448],
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[193, 208, 65473, 65488],
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[209, 256, 465, 512],
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[257, 448, 0, 0],
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[449, 464, 65473, 65488],
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[465, 512, 465, 512],
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[513, 57537, 0, 0],
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[57538, 57552, 65474, 65488],
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[57553, 57600, 57553, 57600],
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[57601, 57793, 0, 0],
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[57794, 57808, 65474, 65488],
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[57809, 57856, 57809, 57856],
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[57857, 65536, 0, 0]
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],
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"write": [
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[0, 192, 256, 448],
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[193, 256, 65473, 65536],
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[257, 448, 0, 0],
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[449, 512, 65473, 65536],
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[513, 57537, 0, 0],
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[57538, 57600, 65474, 65536],
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[57601, 57793, 0, 0],
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[57794, 57856, 65474, 65536],
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[57857, 65536, 0, 0]
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],
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"shadowed": [4, 12, 32, 64, 260, 268, 288, 320, 352, 416, 65535],
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"io": [192, 193, 448, 449, 57536, 57537, 57792, 57793, 65535]
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}
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## Application
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Perform, in the order listed:
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"hires": false,
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If `hires` is true, access IO address `0x57`; otherwise access IO address `0x56`.
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"lcw": false,
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If `lcw` is true, write any value to IO address `0x81` twice; otherwise write to IO address `0x80` at least once.
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"80store": true,
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If `80store` is true, access IO address `0x01`; otherwise access IO address `0x00`.
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"shadow": 12,
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Store the value of `shadow` to IO address `0x35`.
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"state": 183,
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Store the value of `state` to IO address `0x68`.
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## Test
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**Only memory areas which are subject to paging are recorded with valid physical addresses.**
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### `read` and `write`
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Each entry looks like:
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[0, 192, 256, 448]
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Which is of the form:
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[logical start, logical end, physical start, physical end]
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Where all numbers are page numbers, i.e. address / 256.
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So e.g. the entry above means that between logical addresses `$00:0000` and `$00:C000` you should find the physical RAM located between addresses `$01:0000` and `$01:C0000`.
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If physical end == physical start then the same destination is used for all logical addresses; if that destination is `0` then the area is unmapped.
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### `shadowed ` and `io`
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An example chain looks like:
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[4, 12, 32, 64, 260, 268, 288, 320, 352, 416, 65535]
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Starting from a default value of `false`, that means:
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* memory remained un-[shadowed/IO] for until page 4 (i.e. pages 0–3);
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* it was then marked as [shadowed/IO] until page 12 (i.e. pages 4–11);
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* it was then un-[shadowed/IO] to page 32;
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* ...etc.
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