mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-30 04:50:08 +00:00
97 lines
2.5 KiB
Markdown
97 lines
2.5 KiB
Markdown
# Apple IIgs Memory Map Tests
|
||
|
||
## Sample test:
|
||
|
||
{
|
||
"hires": false,
|
||
"lcw": false,
|
||
"80store": true,
|
||
"shadow": 12,
|
||
"state": 183,
|
||
"read": [
|
||
[0, 192, 256, 448],
|
||
[193, 208, 65473, 65488],
|
||
[209, 256, 465, 512],
|
||
[257, 448, 0, 0],
|
||
[449, 464, 65473, 65488],
|
||
[465, 512, 465, 512],
|
||
[513, 57537, 0, 0],
|
||
[57538, 57552, 65474, 65488],
|
||
[57553, 57600, 57553, 57600],
|
||
[57601, 57793, 0, 0],
|
||
[57794, 57808, 65474, 65488],
|
||
[57809, 57856, 57809, 57856],
|
||
[57857, 65536, 0, 0]
|
||
],
|
||
"write": [
|
||
[0, 192, 256, 448],
|
||
[193, 256, 65473, 65536],
|
||
[257, 448, 0, 0],
|
||
[449, 512, 65473, 65536],
|
||
[513, 57537, 0, 0],
|
||
[57538, 57600, 65474, 65536],
|
||
[57601, 57793, 0, 0],
|
||
[57794, 57856, 65474, 65536],
|
||
[57857, 65536, 0, 0]
|
||
],
|
||
"shadowed": [4, 12, 32, 64, 260, 268, 288, 320, 352, 416, 65535],
|
||
"io": [192, 193, 448, 449, 57536, 57537, 57792, 57793, 65535]
|
||
}
|
||
|
||
## Application
|
||
|
||
Perform, in the order listed:
|
||
|
||
"hires": false,
|
||
|
||
If `hires` is true, access IO address `0x57`; otherwise access IO address `0x56`.
|
||
|
||
"lcw": false,
|
||
|
||
If `lcw` is true, write any value to IO address `0x81` twice; otherwise write to IO address `0x80` at least once.
|
||
|
||
"80store": true,
|
||
|
||
If `80store` is true, access IO address `0x01`; otherwise access IO address `0x00`.
|
||
|
||
"shadow": 12,
|
||
|
||
Store the value of `shadow` to IO address `0x35`.
|
||
|
||
"state": 183,
|
||
|
||
Store the value of `state` to IO address `0x68`.
|
||
|
||
## Test
|
||
|
||
**Only memory areas which are subject to paging are recorded with valid physical addresses.**
|
||
|
||
### `read` and `write`
|
||
|
||
Each entry looks like:
|
||
|
||
[0, 192, 256, 448]
|
||
|
||
Which is of the form:
|
||
|
||
[logical start, logical end, physical start, physical end]
|
||
|
||
Where all numbers are page numbers, i.e. address / 256.
|
||
|
||
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`.
|
||
|
||
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.
|
||
|
||
### `shadowed ` and `io`
|
||
|
||
An example chain looks like:
|
||
|
||
[4, 12, 32, 64, 260, 268, 288, 320, 352, 416, 65535]
|
||
|
||
Starting from a default value of `false`, that means:
|
||
|
||
* memory remained un-[shadowed/IO] for until page 4 (i.e. pages 0–3);
|
||
* it was then marked as [shadowed/IO] until page 12 (i.e. pages 4–11);
|
||
* it was then un-[shadowed/IO] to page 32;
|
||
* ...etc.
|