[Coco] Screen Type 8 code ?
L. Curtis Boyle
curtisboyle at sasktel.net
Sun Jul 19 01:18:30 EDT 2020
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:
> 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.
> 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 ?
>>> Coco mailing list
>>> Coco at maltedmedia.com
> Coco mailing list
> Coco at maltedmedia.com
More information about the Coco