HP 2671 Graphics ROM

22 Mar 2010

...
    PSU is indeed the same, HP-IB board is the same
02670-60072   Rev.A ROM 
  (U15) 02670-80078, Processor (U2)8039, (U13)
Empty socket.  
 DO you mean U13 is empty? What about U14? Is there a 2K*8 RAM (2016,
 6116) on this board at all?  
 Yes U13 is empty, U14 are empty holes.
 No RAM at all on the board, the dipswitch 2K is open too.
 So I suppose I can place a 6116 in the U13 socket, and switch the 2K
 dipswitch to closed, to have the advantage of a smal hp-ib buffer.
 Should speed up data transfer a little.. 
The DIP switch you mention has nothing to do with the RAM. According to 
the seckematic it swtiches one of the address lines to the external ROM 
(U15), and I think you should leave it in the position it's set to.

I have no idea if the HPIB interfac firmware will automatically recognise 
the external RAM. My printer has a single 2016 chip (strangely marked 
with an 02670-xxxxx number _and the 2016 number) in position U13. U14 is 
empty.

...
   Right. Sounds
like I'd better have a go at buildign a device 
 to read out 8049s...  
 Would be nice.. 
I will see what I can do...

-tony

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HP 2671 Graphics ROM