Evening All,

Not sure if this was ever a GFX card but I rememberer it helping me with Nemac 4 and my 040, but now it's time to go, so here it for sale:

Grafitti GFX Adaptor

Thanks for looking

Last edited by Etho on 24-Dec-2018 at 06:53 PM.
Last edited by Etho on 24-Dec-2018 at 06:20 PM.

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¸,ø¤º°`°º¤µ-A1 - 256mb - - Wireless Net - OS4 Final¸,ø¤º°`°º¤ø,¸¸

@Etho
Merely a C2P converter but a nice speedup on the Limited software that it did support

◾changes the Amiga bitplaned graphics into chunky pixel mode
◾allows specially adapted software to display 256 colors out of 262144, even on an A1000
◾maximum resolution is 768×576 pixels on AGA Amigas or 384×576 pixels on OCS / ECS Amigas
◾the image is stored in Amiga Chip RAM
◾graphics is generated by a VGA RAMDAC
◾attaches to the DB23 RGB port, the display is connected to the Graffiti
◾PAL and NTSC compatible

@thread
Rats, I have been wanting one of those for my A1000.
Oh well, I still have a rom upgrade to finish first.

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John 3:16

@Etho

Was a clever idea. Did it help with ADoom?

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"Art challenges technology. Technology inspires the art."
John Lasseter, Co-Founder of Pixar Animation Studios

@BigD

Didn't even realise aDoom had supported that!, would have been nice to give it a go but I'd started packing up all my Amiga gear by then, moved on to the PC....but still have my A2000 and MicroA1.

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¸,ø¤º°`°º¤µ-A1 - 256mb - - Wireless Net - OS4 Final¸,ø¤º°`°º¤ø,¸¸

I had one once, couldn't even get it to work on my A1200 (possible user error ).

The Indivision AGA Mrk2 was meant to get updated with Graffiti support which would have been great if if ever happened but Jens never delivered unfortunately.

Interesting note, the Indivision ECS has Graffiti support build in.

@zipper

I've been wondering how this technically worked. Is it like an Akiko chip where the data must be written manually per whole frame?

Or does it somehow read the colours in from the RGB port then rearrange it in the VGA framebuffer per line?

Perhaps using a custom palette. Or even interleaved mode. I don't know.

@Hypex

Some explanation:
http://wiki.icomp.de/wiki/Graffiti

Is there any actual performance difference compared to AGA/ECS?

Quote:

utri007 wrote: Is there any actual performance difference compared to AGA/ECS?

Yes, but only on software with Grafitti support.

ShapeShifter (Macintosh emulator) and some 3D FPS games.

@zipper

Thanks. I actually found that today. So it somehow used the chipram as the chunky buffer as expected. But not in a dlrect linear sense. So some block copying was still needed. Single pixel writes would be speed up.