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Jeff Corr
12/04/05 12:21
Read: 424 times


 
#104670 - 80c51 history
Responding to: Jan Waclawek's previous message
I noticed this the other day, which I thought "hrm, thats cool..."

At my job as an IT person, I was punching down phone cable
in the phone room the other day and went over and actually
looked at the old Tadiran phone switch that is sitting in
the corner, unused. Never paid much attention to it before,
but each slot card has at least 4 80c51s (copyrighted 1980,
printed right on the chip). Looks like each one was connected
to 4 other dedicated ICs that handled the calls, but kinda
makes me wonder what the specific function of the 8051s was.
Were they simply for communicating to the Tadiran backplane
which phone pairs were in use? Obviously, I doubt an original
8051 could handle the actual data of 100s of phone conversations
per chip... at least not well. I'm thinking more along
the lines of system monitoring on the backplane. Any thoughts?
I don't have a model number, but its been out of use for at
least 10 years. I'm asking my boss tomorrow to scrap it. Good
source of crystals and caps, but I doubt the older 8051s are
worth keeping, even if they are socketed.

List of 51 messages in thread
TopicAuthorDate
Happy birthday, 8051!      Jan Waclawek      11/28/05 08:44      
   The Silver Aniversary      Neil Kurzman      11/28/05 09:15      
   What?      Donald Catto      11/28/05 10:07      
   Year 1981!      Arif Deshmukh      11/28/05 11:38      
   Perhaps the '51 is 26 yrs of age      Phillip M Gallo      11/28/05 13:02      
      announcement      Jan Waclawek      11/28/05 14:12      
         Intel's Official Date      Phillip M Gallo      11/28/05 17:03      
            birthday      Jan Waclawek      11/29/05 00:45      
      before my time !      Steve M. Taylor      11/28/05 17:40      
         still a mere child...      Hal Albach      11/28/05 17:48      
            another mere child      Phillip M Gallo      11/28/05 22:16      
               An infant over here...@ 31 y.o!      Valentin Angelovski      11/28/05 23:12      
                  Another infant... @31 y.o.      Mariusz Sobkowiak      11/28/05 23:58      
                     true, but      Erik Malund      11/29/05 06:09      
      This is really a long time ...      Jörg Rockstroh      11/29/05 01:09      
         This is really a long time ...      Grant Beattie      11/29/05 09:45      
            Re: old chips...      Valentin Angelovski      11/29/05 15:48      
            D87C51      Farshid Jafari Harandi      11/29/05 16:52      
               IT must be 1980      Anil Gupta      11/30/05 03:54      
                  RE : 1980      Farshid Jafari Harandi      11/30/05 12:10      
                     1980 is the chip mask Copyright notice      Phillip M Gallo      11/30/05 13:49      
                        what is chip Mask copyright?      Anil Gupta      11/30/05 23:05      
                           No      Neil Kurzman      12/02/05 08:52      
                     timestamp      Jan Waclawek      12/05/05 00:44      
            TS80C31X2      Neil Kurzman      11/29/05 17:15      
   Chip mask protection      Phillip M Gallo      12/01/05 00:25      
      US Only Again??      Ian Bell      12/01/05 04:33      
         general copyright act?      Jan Waclawek      12/01/05 04:43      
            International Law      Ian Bell      12/01/05 04:51      
      That was their downfall, BTW      Richard Erlacher      01/28/06 12:56      
         history      Jan Waclawek      01/28/06 14:57      
   Intel inside      Jan Waclawek      12/02/05 03:05      
      I am not surprised      Slobodan Mandaric      12/02/05 04:10      
         Had Intel taken more interest in 8051      Anil Gupta      12/02/05 04:41      
         Me neither      Valentin Angelovski      12/02/05 05:11      
      Memories 8051 Design      Phillip M Gallo      12/02/05 16:35      
         Another good article      Farshid Jafari Harandi      12/03/05 09:56      
         Intel gives up mcus gradually?      Jan Waclawek      12/09/05 02:15      
   Congratulation Philips      Peter Dannegger      12/03/05 11:58      
      Good Article .. DataBooks      Phillip M Gallo      12/03/05 15:32      
      how much is it Philips?      Jan Waclawek      12/03/05 15:49      
         Me too      Craig Steiner      12/03/05 16:26      
   80c51 history      Jeff Corr      12/04/05 12:21      
   I have found      Oleg Sergeev      01/20/06 08:49      
      go to this page      Kevin Timm      01/20/06 08:52      
         yes, you catched it!      Oleg Sergeev      01/20/06 08:55      
      nice piece      Jan Waclawek      01/20/06 13:17      
   Lindy barcode reader      Jez Smith      01/20/06 10:29      
      appnote?      Jan Waclawek      01/20/06 13:05      
         its just usefull      Jez Smith      01/20/06 13:29      
      Generic 8051 board at large      Grant Beattie      01/23/06 13:11      

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