Cores para Addon Jamma del ZX-Uno

Cores de placas Arcade / Arcade board cores
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neuro_999
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Registrado: 06 Oct 2015, 10:14

Re: Cores para Addon Jamma del ZX-Uno

Mensajepor neuro_999 » 07 Oct 2018, 15:19

I tested with the 6bit dac of zxdos, and works ok.
I atach a photo of the screen. Dont show it very well, but show the shadow of the clouds.
Imagen

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grobda
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Registrado: 15 Sep 2018, 11:52

Re: Cores para Addon Jamma del ZX-Uno

Mensajepor grobda » 07 Oct 2018, 23:45

I think I understand now, although dark grey is possible, clouds are rendered as solid light grey. Ideally they would be white/light grey/dark grey to be more like the original PCB, but core just assigns closest value.

so the screenshot (which I looked at when buying) is incorrect (and misleading).

Darfpga
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Registrado: 06 Oct 2018, 20:46

Re: Cores para Addon Jamma del ZX-Uno

Mensajepor Darfpga » 10 Oct 2018, 22:03

neuro_999 escribió:I tested with the 6bit dac of zxdos, and works ok.
I atach a photo of the screen. Dont show it very well, but show the shadow of the clouds.



Just to check a little bit more :

Clouds use sprite lut (rom) set x0C which give sprite colors x30/x31/x32/x33.

green-red rgb lut gives x00/xAC/xEE/x28
blue-green rgb lut gives x00/xB5/xBD/xA5

which in turn gives :
red : x00/x16/x17/x14
green : x00/x16/x17/x14
blue : x00/x16/x17/x14

which are 3 differents shade of grey for system with 5bits per colors.

x16 = b10110
x17 = b10111
x14 = b10100

For system with 4bits per colors 1 lsb is lost => x16/x17 merge into one single color.

For system with 3bits per colors 2 lsb are lost => x16/x17/x14 merge into one single color.

Anyway neuro_999 picture seems to have only 2 colors for clouds which is strange for 6bits system.

Unfortunatly I can't get zx-uno timepilot source code to check any further.

Best regards.
Dar.

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neuro_999
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Re: Cores para Addon Jamma del ZX-Uno

Mensajepor neuro_999 » 10 Oct 2018, 23:45

The source is in my git.
https://github.com/neurorulez/jammazx1/ ... /timepilot
I saw the problem. When downgrading video bits i use greater bits to pass to the dac... I will try to get lesser bits.

Btw in the 6 bit system i see all the grey shades... The problem is the photo with the mobile to the screen. :)

Enviado desde mi ONE A2003 mediante Tapatalk

Darfpga
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Registrado: 06 Oct 2018, 20:46

Re: Cores para Addon Jamma del ZX-Uno

Mensajepor Darfpga » 11 Oct 2018, 23:31

neuro_999 escribió:The source is in my git.
https://github.com/neurorulez/jammazx1/ ... /timepilot
I saw the problem. When downgrading video bits i use greater bits to pass to the dac... I will try to get lesser bits.

Btw in the 6 bit system i see all the grey shades... The problem is the photo with the mobile to the screen. :)

Enviado desde mi ONE A2003 mediante Tapatalk


Thanks for the link to your source code.
I saw only 3 bits are used for 15khz and even only 2 bits for blue in scandoubler for 31khz (vga). You should extend to at least 5 bits if possible (required more memory for scandoubler)

Best regards
Dar.


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