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Rev

So many good answers, but I went with this one as it has a great source.
– Evert
Commented Feb 26 at 0:22
1

The quote from the IBM PC guide is just perfect.
– Samveen
Commented Feb 26 at 3:33
1

I think one place I worked at in 1989, had a copy of the technical reference. It was an A5 ring binder, with a purple hard cover. A remember a listing of the BIOS in one of the appendixes.
– Neil
Commented Feb 26 at 11:55
13

Loving the casualness of that statement... "If you choose to write your own operating system".
– fooquency
Commented Feb 26 at 17:46
2

"IBM PC was surprisingly welcoming of alternate operating systems right from the start"; actually, from day 1, they supported PC-DOS, CPM-86 (and USCD Pascal system)" - initially, it wasn't clear whether PC-DOS or CPM-86 would prevail...
– poncho
Commented Feb 26 at 19:42

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