[Coco] 26-3134b

[rietveld rietveld]

thank you for the info. seems like it a bit more work than i thought
  

  

  

  
  
  
  
  
>   
> On Nov 25, 2020 at 7:52 PM, Ed Snider  <zippster278 at gmail.com>  wrote:
>   
>   
>  Yes Henry, that's right. If you have a 'B' type CoCo2 with the single ROM chip  
> that hasn't been upgraded to extended basic, you'll need to burn a new rom  
> chip and remove / install jumper wires.
>
> A standard 28 pin, 16K eprom (27C128 or similar) can be used.
>
> Extended BASIC 1.1 goes in the lower 8K of the chip, and Color BASIC 1.3
> in the upper 8K.
>
> For your convenience, here is the appropriate rom file...
> https://drive.google.com/file/d/1cJlwDWX9EVv4-wAlFM_uLK0wUsLgzOu-/view?usp=sharing   <https://drive.google.com/file/d/1cJlwDWX9EVv4-wAlFM_uLK0wUsLgzOu-/view?usp=sharing>
>
> And here is a picture of an upgrade I did on one, showing the jumpers...
> https://drive.google.com/file/d/14u3wsHucg8d-pJclRlLooJRboT0ZPiqu/view?usp=sharing   <https://drive.google.com/file/d/14u3wsHucg8d-pJclRlLooJRboT0ZPiqu/view?usp=sharing>
>
> There are five jumper wires that will need to be removed and rewired to the 128K position.
>
> - Ed
>
>
> >  On Nov 25, 2020, at 4:17 PM, David Ladd  <davidwladd at gmail.com>  wrote:
> >   
> >  Henry,
> >   
> >  Ed's ECB in the 24to28pin adapter is designed for the CoCo 2's and CoCo 1's
> >  that have the empty 24 PIN ROM socket.
> >   
> >  If you pull the Color Basic ROM and install his ECB ROM upgrade then the
> >  CoCo would not startup.
> >   
> >  Color Basic sits at $A000-BFFF
> >   
> >  Extended Basic sits at $8000-9FFF
> >   
> >  Later CoCo2's that have a 28PIN ROM have Color Basic and Extended Color
> >  Basic in one chip.
> >   
> >  At least from the service manual I can find for the model # you provided
> >  shows a U13 where the Extended Color Basic ROM is to be installed.
> >   
> >  On Wed, Nov 25, 2020 at 1:59 PM rietveld rietveld  <rietveldh at hotmail.com>
> >  wrote:
> >   
> >>  Can a coco 26_3134b's stock color basic 1.3 rom be replaced with Ed's ECB
> >>  rom that he has on his website?
> >>   
> >>  Sent from my BlackBerry — the most secure mobile device
> >>   
> >>  --
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> >>   
>
>
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