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docs: add instructions for Windows XP (#666)

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Co-authored-by: hello-smile6 <73048226+hello-smile6@users.noreply.github.com>
Co-authored-by: Fabian <copy@copy.sh>
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*Most of this document also applies to Windows 2000.*
You can download Windows 2000 from [WinWorld](https://winworldpc.com/download/413638c2-8d18-c39a-11c3-a4e284a2c3a5).
Use QEMU to create `winxp.img`:
```
qemu-img create winxp.img 2G
qemu-system-x86_64 -m 512 -drive file=winxp.img,format=raw -cdrom en_windows_xp_professional_with_service_pack_3_x86_cd_vl_x14-73974.iso
```
Follow setup instructions.
The next step fixes `Uncaught RangeError: Maximum call stack size exceeded` in Chrome during Windows 2000/XP boot in v86.
After installation change computer type to "Standard PC" as described [here](http://web.archive.org/web/20220528021535/https://www.scm-pc-card.de/file/manual/FAQ/acpi_uninstallation_windows_xp_english.pdf):
Start > RightClick "My Computer" > Manage >
Device Manager > Computer > RightClick "ACPI Uniprocessor PC" > Update Driver... >
No, not this time > Next > Install from a list or specific location (Advanced) > Next >
Don't search. I will choose the driver to install. > Next > Standard PC > Next > Finish.
Restart the VM, follow multiple "Found New Hardware Wizard" dialogs with default options.
Now `winxp.img` is ready for v86. You can use [the website](https://copy.sh/v86/) to run it:
Specify `winxp.img` as a hard drive and optionally set memory size to 512 MB.
Or run it in a custom html file as described below.
Get seabios.bin and vgabios.bin from [here](https://github.com/copy/v86/tree/master/bios),
get libv86.js and v86.wasm from [releases](https://github.com/copy/v86/releases/tag/latest).
Create `winxp.htm` with this content (assuming all the files are in the same folder):
```html
<!doctype html>
<script src="libv86.js"></script>
<script>
onload = function()
{
new V86Starter({
wasm_path: "v86.wasm",
bios: { url: "seabios.bin" },
vga_bios: { url: "vgabios.bin" },
hda: {
url: "winxp.img",
size: 2 * 1024 * 1024 * 1024,
async: true
},
memory_size: 512 * 1024 * 1024,
screen_container: screen_container,
autostart: true,
});
}
</script>
<div id=screen_container>
<div style="white-space: pre; font: 14px monospace"></div>
<canvas style="display: none"></canvas>
</div>
```
To open this html file locally a HTTP server is needed. The standard Python server `python -m http.server` doesn't support HTTP range requests.
You can use [http-server](https://www.npmjs.com/package/http-server) or [devd](https://github.com/cortesi/devd).
Start the server (from the same folder as `winxp.htm`):
```
npx http-server
```
Open http://localhost:8080/winxp.htm in the browser.
Windows XP load time (until start button becomes responsive) in Chromium on my computer:
* 3 min second time
* 4 min (first time or if cache is disabled)
* 12 min second time if Network tab in Developer Tools is open
* 17 min (first time or if cache is disabled) and Network tab in Developer Tools is open
Sometimes Windows XP hangs after boot (before it is interactive) in v86,
displaying only desktop wallpaper without taskbar or desktop icons.