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Mail Archives: geda-user/2015/07/07/00:38:18

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Message-ID: <559B5783.40100@neurotica.com>
Date: Tue, 07 Jul 2015 00:37:23 -0400
From: "Dave McGuire (mcguire AT neurotica DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] OT-PL/M
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Reply-To: geda-user AT delorie DOT com

On 07/06/2015 08:02 PM, John Doty wrote:
>>>> More history: In the early 80s, IBM first went to Gary Kildall 
>>>> of CP/M for their IBM-PC DOS.  CP/M did have several PL/M 
>>>> modules (pip for one).  If Gary had not ignored IBM and go 
>>>> sailing instead of meeting with the IBM execs, IBM PC-DOS may 
>>>> have had some PL/M in it.  However, we got ms-dos instead.  As 
>>>> I understand it, Kildall used a DEC PDP minicomputer running a 
>>>> PL/M cross compiler in order to develop CP/M.
>>> 
>>> Must have been one of the bigger DEC machines. He wrote the PL/M
>>>  cross compiler in Fortran, and it needed at least a 32 bit 
>>> machine. PDP-10, PDP-20, or VAX maybe.
>> 
>> Please pardon me for butting in, but someone mentioned PDPs, so.. 
>> ;)
>> 
>> The PL/M was done on a PDP-10 (DECsystem-10), a 36-bit machine.
> 
> I assume you mean the original development. The actual code was 
> supposed to run on any Fortran with a big enough word size. The code 
> certainly looked very friendly to IBM Fortran IV, but I can’t say I 
> tried it in that environment. I certainly didn’t encounter any use
> of the peculiar DEC Fortran extensions I’ve seen in other code.

  Duh, wow, I don't know what illiterate part of my brain caused me to
type that.  What I meant was "the CP/M development", not "the PL/M".
Please re-eval the sentence with that correction. ;)

>> The VAX was announced about five years after Kildall began CP/M 
>> development.
> 
> That's right, I wasn’t thinking. 70’s, 80’s, it’s all a blur...

  I know what ya mean..

>> (Nit: there's no such thing as a PDP-20, but there are 
>> DECsystem-20s, which are PDP-10s.)
> 
> I’d forgotten that nit, but now my three remaining brain cells are 
> saying yes.

  Yup.  I have a few here. =)

>> Aren't the "FinFETs" in modern microprocessors not the same thing 
>> that Bokor et al developed more recently?
> 
> As with all inventions, the origins are murky if you look closely 
> enough, and there are variations. I recall the idea of surrounding 
> the channel with gates from an early description of FET technology 
> from the 1960’s. It was part of a pedagogical presentation, which 
> then went on to explain that real FETs used a planar structure. Jeff 
> was certainly involved in the revival of this idea, but I’m not 
> straying any farther into the territory of patent lawyers ;-)

  Hmm ok.  Well from the industry buzz, they're clearly onto something
big!  I'll have to read up on it one of these days.

              -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

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