segmented memory models

dwight elvey dkelvey at
Sun Aug 3 00:47:13 CDT 2008

> From: rtellason at
> On Saturday 02 August 2008 21:39, Chuck Guzis wrote:
>> What was surprising is that no IBM PC product ever used the 80186.
> I seem to recall something about the use of "reserved" interrupts or similar
> that was the reason behind that -- apparently somebody (m$?) used 'em anyhow,
> making the '186 not an option.

 The 186 was really intended as a controller. It was an 86 instruction
to simplify coding in languages that were developed for the 86.
It had a few enhaced functions. Memory mapping saved external
hardware. As I recall, it had a serial port as well. This made it
good for embedded Forths.

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