Wednesday, December 19, 2007

playing with simh: running unix v5

One of the thing in computer history that I'm fascinated is unix. It's one of the most important Operating System, that most people today didn't use. And already have many concept, that is added much later time, in commercial PC operating system. And it already have the concept of code sharing, before Free Software or Open Source exist.

Pretty all of the resource is from this article. Except my opinion

To simplify the step.

1) download
2) unzip everything
3) create a pdp11.ini

set cpu U18
attach rk0 unix_v5_rk.dsk

3) then run the pdp11 emulator. This I assume that you installed simh already.
note: on windows you might need to copy the pdp11 emulator, from simh, to the same folder as the unix.

you should see the following. prompt

PDP-11 simulator V3.7-0
Disabling XQ

just type unix

which shows
, then type root. Now you should see the familiar root shell.

But note it's not a unix as we know on linux, or bsd, or any modern unix(i think), for example there is no cd, it's chdir. And many thing is not there, or very different.

But that's unix. What cool, is that, it contain the source code for unix as well. And amazing how to stuff the OS, in a relatively small package

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