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???
04/18/07 11:54
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 		 #137414 - Identify a chip.
I am trying to fix a display(LED BCD X-Y for a mill) and I was abile to Identify all the chip excpet on. The one that seems to not be working.It looks like it was made for the display company(in this case Newell). I sent and EMail to newell asking them about it but I was woundering if you guys could help.

The LEDs are controlled with ULN2803 Darlingtons driven by 74hc573(shift latch register). the other side looks like PNP transistors with 5v in.Seems pretty standard.but the chip that drivers the display is an unknown 40 pin chip.Standard power config (20 GND 21 VCC). It does NOT have any external clock line(Not that I could see) and it controls the display and manages the button inputs. it's got copyrights from Intel and Phillips.

The main processor is an 80c31. I put my scope on the 80c31 and it seems to be firing up just fine.it looks the the 80c31 directly connects to the mystery chip. I googled the He** out of the numbers on the chip. No go. 282-10050 looks like a Newell part number.

List of 31 messages in thread
TopicAuthorDate
Identify a chip.            01/01/70 00:00      
   why a chip            01/01/70 00:00      
      it's for a friend.            01/01/70 00:00      
         it's for a friend            01/01/70 00:00      
            defective programmed chip.            01/01/70 00:00      
   An 8051?            01/01/70 00:00      
      just an another 8051 with ROMed firmware?            01/01/70 00:00      
      corrections            01/01/70 00:00      
         "it would have to be way newer"            01/01/70 00:00      
            Legacy stuff ?            01/01/70 00:00      
               Philips (c) 1989 Intel (c) 1980            01/01/70 00:00      
         no clock?            01/01/70 00:00      
            I did some probing.            01/01/70 00:00      
               also EA is.            01/01/70 00:00      
            crazy.            01/01/70 00:00      
               One for X and one for Y?            01/01/70 00:00      
                  No...I don't think.            01/01/70 00:00      
                     You're referring to a milling machine, right?            01/01/70 00:00      
   8279?            01/01/70 00:00      
   Conclusion            01/01/70 00:00      
      how do you know that it is dead?            01/01/70 00:00      
         used a scope.            01/01/70 00:00      
            the standard checklist            01/01/70 00:00      
   suggestions            01/01/70 00:00      
      I made correction already.            01/01/70 00:00      
         careful now ...            01/01/70 00:00      
   Screw it            01/01/70 00:00      
      Better yet...            01/01/70 00:00      
         Hurco            01/01/70 00:00      
      Know that's Cool.            01/01/70 00:00      
      Looks like the old Bridgeport ...            01/01/70 00:00      

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