[Coco] Screen Type 8 code ?

[L. Curtis Boyle]

To clarify: DWSet’s X and Y sizes are character based, not pixel based (and each character is 8x8 pixels). So the “28 18” sequence I specified is for 40x24 CHARACTERS, which means 40x8 (320) by 24x8 (192) PIXELS. Which is what was asked for. 

Sent from my iPhone

> On Jul 18, 2020, at 6:29 PM, Robert Gault <robert.gault at att.net> wrote:
> 
> Charlie,
> 
> More specifically, you want to read portions of the Coco 3 Service manual (p 12 is good) and the OS-9 Level Two Operating System manual
> (DWSet Windows p 3-12, system calls SS.AScrn Technical Reference p 8-142) to see how to open any kind of window.
> The Display (an Os-9 command) uses the format of the DWSet command used in assembly code and thus is
> Code: 1B 20
> Parameters: STY CPX CPY SZX SZY Frg Bkg Bordr
> STY: 01   40x24 text
>     02   80x24 text
>     05   640x192 2 colors
>     06   320x192 4 colors
>     07   640x192 4 colors
>     08   320x192 16 colors
> 
> Curtis's sequence is
> 1B 24 DWEnd turn off current window
> 1B 20 DWSet start a window
> 8     type is 320x192x16
> 0 0   top left corner is 0,0
> 28 18 lower right corner is 40 bytes wide & 24 bytes deep
> 0 2 2 palette registers used for colors
> 1B 21 select window which in this case is Current
> 
> As 4 bits are used for 16 colors, that's two pixels per byte on a 16 color screen. The values 28 18 should be checked.
> 
> Robert
> 
> L. Curtis Boyle wrote:
>> DISPLAY 1B 24 1B 20 8 0 0 28 18 0 2 2 1B 21
>> (That’s one way)
>> 
>> L. Curtis Boyle
>> curtisboyle at sasktel.net
>> 
>> 
>> 
>>>> On Jul 18, 2020, at 3:39 PM, coco at jechar.ca wrote:
>>> 
>>> 
>>> What is the NitrOS9 code to open a 320x192 16 color graphics window
>>> Mode 8 ?
>>> 
>>> Charlie
>>> 
>>> -- 
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>>> 
>> 
> 
> 
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