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Apr 13th 2012 at 4:17:56 PM •••

What's that with the CP/M predecessor? Wasn't it RT-11, a one-task RT OS, while RSX-11 was much more complex and supported multitasking? BTW, when DEC switched from PDP-11 line to its 32-bit extention, the VAX, it was RSX-11 developer, Dave Cutler, who was given the task to write a reference OS for the new platform, the famous VAX/VMS. Which later, when Cutler left for Microsoft, resurfaced in a new form as Windows NT.

So it's basically TWO different non-intersecting lineages, as follows: RT-11 -> CP/M -> Q-DOS -> MS DOS -> Windows (classic), while the other line is RSX-11 -> VMS -> OS/2 NT -> Windows NT.

Edited by Khathi
Mar 19th 2012 at 12:20:55 PM •••

Some footnotes that probably don't belong in the article, but I wanted to write them down anyway:

  • There were a few ISA cards that could indeed do bus mastering, typically by fooling the ISA DMA controller into giving them control of the bus. The most famous of these was the Adaptec 1540/1542 SCSI HBA and its clones and follow-ons. It should be noted that this was a hack (though not nearly as awful a hack as VLB was; the 154x was rock-stable when tuned properly), and would crash systems with DMA problems or just plain bad build quality (much more common back in the 386 era than it is now); indeed, the 154x BIOS even came with a diagnostic test to see if the hack would crash your system!

  • Before VGA came out, there were a few "Super EGA" and even "Super CGA" vards as well. The ATI EGA Wonder (which had one of the first TV-out implementations, as well as a scan converter so you could use EGA modes on a CGA monitor) was an example of the first, while the IBMP Cjr's "VGA" system and cards like the Persyst CGA and the 400-line CGA on the Compaq Portable and AT&T PC 6300 were examples of the latter.

More tidbits as I think of them...

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Mar 24th 2012 at 8:10:43 AM •••

What's really funny about all those Super CGA cards, is that the most popular of them, the IBM's P Cjr "VGA", managed to enter the public memory under a "Tandy" moniker.

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