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20

How interchangeable was PC BIOS? Usually not interchangeable at all. Keep in mind, there is no single PC-BIOS, but a machine BIOS. Different CPUs, chips sets and additional hardware need specific initialisation. And, at least for generic DOS, specific drivers. To start with, plug-in-compatible bios was only a thing for 100% hardware clones, something only ...


21

No reason to expect it works at all. So if the CPU can even start executing the code, the moment where it goes wrong is when there are instructions for a newer CPU, or some chipset-specific initializations are done. The BIOS is tailored for the specific motherboard, which will have a certain chipset for a certain CPU class, and therefore it also expects ...


10

Although it was possible to customize MS-DOS to use machine-specific services, the actually shipping generic versions did need an IBM-compatible BIOS so you will need to provide it if you want to run unmodified DOS distributions. In addition, various programs running on top of DOS did use additional BIOS services (when they didn’t access hardware directly). ...


21

TL;DR: It all boils down to the question if you want to build a fully IBM like system with ROM BIOS independent of DOS, with all the bells and whistles attached, or if your goal can be reached with a running DOS with a minimum in BIOS compatibility, just enough to serve whatever application need to run on top of DOS. Unlike often assumed, MS-DOS does neither ...


3

Normally you would enter the parameters in for a custom drive. Normally you would also have to figure out what native CHS parameters for the CF card are so you can type them in or select one of existing ones that match best. As no existing type is nowhere near 500MB, you can't utilize the card for 500MB unless you type in custom parameters. As it is a 4GB ...


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