![]() We then go through to the C++ fake BIOS of DOSBox, which handles the BIOS call by calling the C standard library I/O functions. Everything before this point has been under DOSBox's x86 emulation. This BIOS call will be intercepted by Windows 95 which, since it has no 32-bit disk driver (DOSBox doesn't simulate a real disk controller), will pass it on to DOS (the one underlying 95), which in turn will make a BIOS call. When a DOS application tries to perform an I/O operation, it will make a DOS system call. Yep! And you can even run DOS apps inside Windows 95, so you can have Virtual 8086 Mode inside your virtual x86 CPU (DOSBox) inside your JavaScript virtual machine, inside a sandbox.ĭisk access here is fun through the sheer number of layers. I'm not sure it practically could, because it's not using a fake filesystem mapped to fopen() calls by intercepting DOS system calls, as DOSBox typically does, but rather DOSBox is giving Windows 95 a real disk image, so you'd have to stuff 131MB into localStorage.) (Unlike the Internet Archive's games, this doesn't do any saving to local storage, sorry. You can listen to CANYON.MID on an emulated Sound Blaster 16! And it turns out with a bit of fiddling you can run Windows 95 in DOSBox and have it mostly work. Then the Internet Archive started hosting DOS games, and I wondered what they were using, thus I found Em-DOSBox.Īt the same time, I was getting a bit of nostalgia for Windows 95, the first upgrade to Windows I ever used. I'd previously wondered if it might be possible to run DOSBox in the browser with emscripten, but there seemed to be nothing working out there.
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