[Coco] [SPAM] Re: Reverse video mod

[Steve Batson]

That sounds exactly like the mod I did years ago.



> On Apr 19, 2015, at 10:19 AM, Zippster <zippster278 at gmail.com> wrote:
> 
> Just checked this out.  
> 
> Looks like it uses a spare NOR gate on U29 to drive DD6 on the MC6847 high whenever INV is low.
> 
> This should be fairly easy to implement in the CPLD code as a dip-switchable mode on my external rom board.
> 
> Neat!
> 
> - Ed
> 
> 
>>> 
>>>> On 19/04/2015 12:59, Joe Grubbs wrote:
>>>> Steve posted pictures of his old CoCo2s, one of which as a Lowerkit and "Reverse video mod", both selectable via chassis mounted toggle switches. The reverse video mod gives green text on a black background.
>>>> 
>>>> Does anyone know what is being done in hardware to make this happen? Is it separate from the Lowerkit? Steve mentioned there might be a blurb about it in an old issue of Rainbow, but I've not yet found it.
>>>> 
>>>> Note that this is something I'd like to do on a CoCo2 with the 6847 VDG (NOT the T1 version, which is apparently more configurable with some clever POKES).
>>> 
>>> Joe,
>>> 
>>> That is a simple mod and was described in one of the "Turn of the Screw" 
>>> articles.
>>> 
>>> http://sparksandflames.com/files/FullTurn.pdf
>>> 
>>> Codimex made this mod a default option on the Codimex CD-6809 machine 
>>> here in Brazil.
>>> 
>>> Daniel
> 
> 
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