A dedicated task and very tight code can be rather impressive. We
controlled an Atomic Absorbtion with 8K core and 8K dram. PDP-11/03 with
an Analog Devices 25 us A/D. Data stream ran at 4K samples/sec. When the
analytical run was done it did a curve fit, 2nd order for everything
thing but Fe which fit better with a 3rd order. Systems device was an HP
9815 calculator to backup the program and print results. I did the
interface electronics for the data acquisition and one of my guys wrote
the code. Really bright guy ... coded in machine language ... no
assembler. ... and it worked for 10 years. With a few more resources we
would have burned the code in proms. We finally replaced it with a
Varian AA that still didn't do quite the job our old machine did.
Political decision since I was retiring.
Dave
On 2/17/20 3:38 PM, John Dammeyer wrote:
-----Original Message-----
From: Marshland Engineering [mailto:[email protected]]
Sent: February-17-20 2:51 PM
To: [email protected]
Subject: Re: [Emc-users] RPI4 is pretty close to a decent machine control
My Rasperberry pi is acting as a database server and works well. I still
marvel at my Southwestern Industries CNC machine that runs on a 8085
(5Mhz)
that controls a 3 axis mill at 2m/min with 2000 line encoders and servo
drives. All programming is conversational and tool compensation is done by
the
8085. I can create subroutines, 8 sided polys, etc and string up to 99
operations into one program. It hs work flawlessly for the 15 years I have
owned it and works almost every day.
I wonder if making PCs work as controllers is the right way to go. The
ATMEGA
could easily do the job, just my c is not up to it.
Having also controlled a very large XY Laser system with 8085 code you can
understand why I'm puzzled that 1GHz and up 32 ARM computers have so much
trouble.
John
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