Answer by Eric Korpela for Why did "protected-mode MS-DOS" never happen?
There was, in fact, a 32-bit protected mode DOS, complete with multitasking thatwas very successful. It did require 16 bit DOS to do the initial load, but once it was loaded, it took over all the...
View ArticleWhy did "protected-mode MS-DOS" never happen?
Software written for MS-DOS used DOS extenders as early as on PC/AT (DOS/16M), and starting from i386-based systems, DOS extenders became really widespread.I'd think it was pretty obvious at the time...
View ArticleAnswer by Stephen Kitt for Why did "protected-mode MS-DOS" never happen?
16-bit protected mode DOS did sort of happen: Concurrent DOS 286 and FlexOS 286 were able to run some DOS applications in protected mode (this involved complex LOADALL shenanigans and revealed bugs in...
View ArticleAnswer by mschaef for Why did "protected-mode MS-DOS" never happen?
And, marketing-wise, did everyone want multitasking and GUI so much that an idea of a single-tasked OS was no longer appealing by definition?In a word, yes.The 80386 came to market in 86/87, well after...
View ArticleAnswer by Justme for Why did "protected-mode MS-DOS" never happen?
The programs that you already had and needed to run were not protected mode programs, they needed to be run in 16-bit real mode anyway.DOS drivers used BIOS for I/O, which also was 16-bit real mode...
View ArticleAnswer by john_e for Why did "protected-mode MS-DOS" never happen?
There was at least one proposal for a 32-bit OS that would have been a drop-in replacement for MSDOS: Marc Perkel's NovOS, submitted to Novell in 1991. The intention was that existing MS-DOS programs...
View ArticleAnswer by Davislor for Why did "protected-mode MS-DOS" never happen?
There were several attempts to introduce an ABI like this, including VCPI (Virtual Control Program Interface) and DPMS (DOS Protected-Mode Services), but the one that came closest to being a standard...
View ArticleAnswer by Bebu for Why did "protected-mode MS-DOS" never happen?
There was multitasking DOS called Wendin DOS constructed with their Wendin Operating System Toolkit (OST.)The toolkit internally appeared to me to be inspired by VMS.To get around the non-rentrant PC...
View ArticleAnswer by Dercsár for Why did "protected-mode MS-DOS" never happen?
In a nutshell: because at that time everybody wanted GUI and multitasking.In the other answers to this question, clever people have listed plenty of technical reasons why it would have been very...
View ArticleAnswer by stsp for Why did "protected-mode MS-DOS" never happen?
I'd think it was pretty obvious at the time thatthe real-mode limitations of both BIOS and MS-DOSReal-mode limitations are not of BIOS or MS-DOS.Real-mode uses a 16bit addressing + segmentation,which...
View ArticleAnswer by supercat for Why did "protected-mode MS-DOS" never happen?
When not using a memory manager, real-mode x86 programs can be viewed as having very fast access to 64K of data stored in RAM, and moderately fast access to another ~500K (depending upon program size)....
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