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Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Mon Nov 03, 2014 5:24 pm
by Fruitcake
I've had an enquiry about whether the Chroma interface will work with the Brazilian TK-85 clone. I don't own one of these and know very little about it. Does any one know how compatible this was with the ZX81? Does it use the same expansion bus signal layout?

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Mon Nov 03, 2014 8:08 pm
by PokeMon
I assume that kmurta has tested the interface on a TK85. 8-)
Maybe ask him to be sure but I am sure he has a TK85 to test with.

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Mon Nov 03, 2014 11:36 pm
by kmurta
The screenshot for Galaxians shows a blue border but there was a bug in the JSZeddy emulator that swapped the blue and green bits of the border colour. When I try the game on real hardware the border appeared as green. I reported the bug in JSZeddy and it has now been fixed, but the Galaxians colourisation file will also need to be updated.
I found better to change the border color to black, see the update file in original post.

The cool thing is that if you don't like of the colors, the coloring can be easily customized. Just change the GalaxCol.asm file and compile it with TASM. ;-)
The CHR$128 mode is a nice clever extension to UDG mode and I have attempted to include logic to support it, but unfortunately there are not the resources available in the IC.
No problem, the games can be easily converted to QS Character Board.

By the way, I try to colorize a game that use the character 127 (CURSOR) as invisible mark, but in the JSZeddy the screen was corrupted when the char 127 is poked on Dfile in Color Mode. Is this a JSZeddy issue or Chroma really can't handle the CURSOR character in Dfile? I am attaching the game so you can check if it can run accurately at the Chroma81.

(The file was moved some posts below)
I've had an enquiry about whether the Chroma interface will work with the Brazilian TK-85 clone. I don't own one of these and know very little about it. Does any one know how compatible this was with the ZX81? Does it use the same expansion bus signal layout?
I assume that kmurta has tested the interface on a TK85. 8-)
Maybe ask him to be sure but I am sure he has a TK85 to test with.
No, I'm not (yet) a happy owner of Chroma81 ;)

The TK85 has the same expansion bus layout but presents some incompatibility in non standard modes like as pseudo-hires and wrx. Some TK85 units can handle pseudo-hires, others can not. With wrx all the units that i tested failed to show a stable display.

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Tue Nov 04, 2014 2:10 am
by olofsen
By the way, I try to colorize a game that use the character 127 (CURSOR) as invisible mark, but in the JSZeddy the screen was corrupted when the char 127 is poked on Dfile in Color Mode. Is this a JSZeddy issue or Chroma really can't handle the CURSOR character in Dfile? I am attaching the game so you can check if it can run accurately at the Chroma81.
I think it is a bug - I'll have a look!

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Tue Nov 04, 2014 4:00 am
by olofsen
I had never encountered this marker trick before! I hope the display is correct now. And is the emulation of the sound effects reasonable?

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Tue Nov 04, 2014 11:24 am
by RWAP
I just think it's amazing how much better the games look with that splash of colour! :D

When will these be available on SellMyRetro?

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Tue Nov 04, 2014 1:17 pm
by kmurta
olofsen wrote:I had never encountered this marker trick before!
It is used by missile AI routine to avoid them to target the destroyed cities.
olofsen wrote: I hope the display is correct now. And is the emulation of the sound effects reasonable?
Is better but was still not completely solved. Note that the characters at right of printed 127 char are moved to the left:
missil.png
missil.png (13.82 KiB) Viewed 2542 times
The sound effects are still not good here, there is an annoying buzzer following the sounds :(

See here (at 3:40min) the gameplay in a real machine: http://youtu.be/dKN2XfVRfx0?list=UUnxeu ... B72_zaGklg

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Tue Nov 04, 2014 7:39 pm
by olofsen
Thanks for your comments - the issue with the characters at the right of printed 127 char that were moved to the left should now be solved, and sound should at least be improved :)

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Wed Nov 05, 2014 3:57 pm
by kmurta
olofsen wrote:Thanks for your comments - the issue with the characters at the right of printed 127 char that were moved to the left should now be solved, and sound should at least be improved :)
Good news! Thank you!

Now the colorized Missile Command is working in JSZeddy :P

I would like to know if it works alright in a real ZX81 with Chroma interface.
missile.png
missile.png (15.88 KiB) Viewed 2491 times
Colorization file: https://sinclairzxworld.com/viewtopic.p ... 202#p31202

Re: Chroma 81 - SCART and Colour interface for the ZX81

Posted: Sat Nov 08, 2014 4:44 pm
by stefano
Probably it is something I should have understood myself reading your posts and webpage carefully, but.. is there a way to use colors in WRX graphics mode ? 8-)