BLuRry

I would what I called "Chat Mauve" is equivalent to the Mix mode of Video7 RGB. My original implementation of video (currently not selectable) lines up with the 140 mode. And 560 mode is just black and white (also written but not selectable as such yet). So really all I haven't done is implement the 160 mode -- but is that worth the effort? Did any software actually use it?

ict@ccess

On Jan 30, 10:51*pm, BLuRry <brendan.rob...@gmail.com> wrote:
> Basically for Chat Mauve, if a hi-bit of a DHGR is low then the byte is rendered as B&W. *If the bit is high, then it is treated as color. *I'm reading about Video 7, but that's just an RGB converter for the //c right? *If so, I don't think the Video 7 could do what Chat Mauve does since that hi-bit would be lost in the RGB signal generator right?
>
> -Brendan


I take it this is programmed with software? The video scanning would
need to be something like the 3200 color screen uses. The color
register of the computer would need to be turned off and on when the
scan line reaches a certain line.
Is it correct to assume that the whole screen can be either in b/w or
color and not have b/w or colored pixels on the same line?

Or do you have some hardware that does this?

Rob

ict@ccess

On Jan 31, 12:15*am, Antoine Vignau <antoine.vig...@laposte.net>
wrote:
> On 31 jan, 05:15, bloomer_au <bloo...@iprimus.com.au> wrote:
>
> > What is chat mauve mode?
>
> > - Wade
>
> Zou...http://mirrors.apple2.org.za/Apple%2...%20Project/Int...
>
> Antoine


This answers the hardware question. But still out of curiousity, can
this mode be programmed by software, the same way the 3200 screen
displays each line, and just turn on/off the color register before the
scan line hits it?

Rob

D Finnigan

mdj wrote:
> On Jan 31, 4:15�pm, Antoine Vignau <antoine.vig...@laposte.net> wrote:
>> On 31 jan, 05:15, bloomer_au <bloo...@iprimus.com.au> wrote:
>>
>> > What is chat mauve mode?
>>
>> > - Wade
>>
>>
Zou...http://mirrors.apple2.org.za/Apple%2...%20Project/Int...
>
> My French is pretty much non existent but from what I can tell it
> supports the same modes as the Video7 RGB card (The AppleColor RGB
> card was made by Video7) but supports even more modes.
>
> Can you tell me if it supports the 16 colour 40 column text mode?
>

It looks like it is only for 80 columns.

BLuRry

Well, RGB cards have their own video scanner built in and can render video in different ways as needed. So, in the case of how I implemented JACE, there is an array of color burst flags for a scanline as it is being rendered.. If the mode is text, or if the mode is double-hires and the "chat mauve"render flag is true and if the lo-order bit is low, then I capture that the color burst is off for that one byte. Otherwise, I mark that the color burst is active. When the scanner hits the end of the row (Horizontal blanking interval) then I take the scanline and render it accordingly using either color or B&W pixels. Because I do this during the HBL, it cuts down on re-rendering time. And if the video mode was unchanged and there were no changes to that scanline since the last VBL, I don't even bother rendering it to save more time. Took a while to get the kinks out but it seems to work ok now for the most part.