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From: George Neuner <gneuner2@comcast.net>
Newsgroups: comp.arch
Subject: Re: Why VAX Was the Ultimate CISC and Not RISC
Date: Fri, 07 Mar 2025 06:03:13 -0500
Organization: i2pn2 (i2pn.org)
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On Wed, 5 Mar 2025 09:16 +0000 (GMT Standard Time), jgd@cix.co.uk
(John Dallman) wrote:

>In article <vq82c8$232tl$7@dont-email.me>, ldo@nz.invalid (Lawrence
>D'Oliveiro) wrote:
>
>> How would you have done games without being able to directly 
>> address screen memory? I'm sure PC/IX, being a Unix-type system, 
>> would have disallowed that.
>
>How? 
>
>There's no memory management hardware in an 8088, and PC/IX ran on a
>basic PC/XT.


Programmatically - the compiler (and/or assembler) could disallow it.

Programmatic isolation works quite well as long as everyone plays by
the rules.  [Which, of course, is hard to enforce.]

>John