[Coco] hardware scrolling revisited...

[Steve Bjork]

The Artifact mode is do to a failure NTSC Color standard to handle the 
screen like the CoCo's 256 dot mode.  The "great and power" Woz used 
this failure in NTSC  to create the Hi-Res Color mode of the apple II.

Tandy never know their CoCo had a four color (Black, White, Red and 
Blue) mode based on the 256 Black and White mode till I shipped them 
PopCorn.  It took many letters and phone calls before they believe this 
mode worked on all CoCos.  (At the time, there was no pal version of the 
CoCo.)  By the time I shipped Mega-Bug, the Artifact was a "Documented" 
graphics mode and why so much design time was spent to support it in the 
CoCo3.

Steve


On 12/2/2013 10:34 AM, Luis Antoniosi (CoCoDemus) wrote:
> Even the NTSC "artifact colors" never existed from Tandy manuals. They
> are always said as monochrome modes. Maybe because of the PAL machines
> that are unable to handle them.
>
> But the service manual for coco2 does talk about them...
>
>
>