[Simh] pdp11 and unix

[Johnny Billquist]

On 2016-02-26 15:58, Gregg Levine wrote:
> Hello!
> Now that I think about the scene, it might have been a frustrated
> PDP-8 at work. I do recall that the exhibit spent more time being
> fixed, then being running....
>
> It is certainly possible you're right.

A PDP-8 would make much more sense in this context. :-)
Very different from a PDP-11...

> But not confused.

Depends on what you were looking at then, perhaps? :-)

	Johnny

>
> Then I was beginning to suffer from information overload.
> -----
> Gregg C Levine gregg.drwho8 at gmail.com
> "This signature fought the Time Wars, time and again."
>
>
> On Fri, Feb 26, 2016 at 9:54 AM, Johnny Billquist <bqt at softjar.se> wrote:
>> On 2016-02-26 15:23, Gregg Levine wrote:
>>>
>>> Hello!
>>> Interesting.
>>>
>>> I was only reporting what I remember as to the history of the whole
>>> example we call UNIX.
>>>
>>> And last year at the Vintage Computer Festival East, (Yes Dave W, the
>>> same one where we crossed paths.), I saw a PDP-11 system having
>>> finished dumping his program output to a TTY setup. I commented then
>>> that the instructions shown resembled an 6502 one, I was also thinking
>>> of the original 6800, but did not say that, and then it wasn't until I
>>> walked away that I thought of a 68000, but only because I was inspired
>>> by something I had read regarding the history of what was used in the
>>> first Mac or its ancestor. And then continuously until much later when
>>> reason caused Apple to switch to the PowerPC. Let's not discuss the
>>> decision to switch to Intel.
>>
>>
>> But then you must have looked at some code that was not PDP-11, or else you
>> are very confused about the 6502, or else you are very confused about
>> assembler in general.
>>
>> You are comparing a processor with generic registers, with lots of
>> addressing modes, and a fully orthogonal instruction set, to a processor
>> that is accumulator based, have rather limited addressing modes, and limited
>> combinations of arguments to instructions.
>>
>> The 6502 have more in common with the PDP-8, I'd say.
>>
>>          Johnny
>>
>>
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