HP 2671 Graphics ROM

[Rik Bos]

> -----Oorspronkelijk bericht-----
> Van: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
> Verzonden: vrijdag 19 maart 2010 22:08
> Aan: cctalk at classiccmp.org
> Onderwerp: Re: HP 2671 Graphics ROM
> 
> > Thanks , HP was talking about adding a graphics chip (ROM).
> 
> My printer -- the one the schematics were produced from -- is 
> a 2671G. 
> 
> > The 2671 has an empty socket on the HP-IB interface board, the one 
> > closest to the printer PCB is empty.
> 
> I think mine does too. I am pretty sure I indicated that the 
> external ROM for that microcontroller was 'N/F' (meaning 'Not 
> Fitted'). You could use a 8039 microcnotrller and an extenal 
> ROM or an 8049. One of the switches on the itnerface board 
> sets the state of the EA pin
> 
> > I'm not sure if that's the one, it could be the ROM on the 
> printer PCB 
> > it self.
> 
> I am also almost certain that my printer PCB has an external 
> ROM. I think it's an 8049 microcnnotroller on there too. 
> Again, I would have to check the settings of the swithes to 
> see if the interal ROM of that microcontroller is used). Of 
> course an 8049 with EA pulled hich acts just like an 8039 AFAIK.
> 
> > It would be very nice if you find out what needs to be replaced, on 
> > the printer PCB on the one I have a 8039 with external ROM is used.
> 
> I should have some time tomorrow to pull the covers and 
> check. We can compare our 2 machines to see jsut what the 
> differences are.
> 
> -tony

Seems a good idea, I'll write down the part numbers so we can compare.

-Rik