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yves
MAME Fan
Reged: 03/20/12
Posts: 2
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video tilemap problem
04/06/12 03:41 AM Attachment: nev_video.zip 42 KB (24 downloads)
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hello ,

this is my first try on the MAME emulator project.
Board info :
CPU : MC68000 8mhz
Video : MC6845
Audio : AY3-8912

I have done for the moment :
1. mapping of the board
2. skeleton of the driver (software run, but still some i/o todo)
3. dump of ROM ,NVRAM, emulation of PAL

currently , I am lost in the decoding of the video section
VIDEO RAM work with 2 BYTES
1 ATTRIBUTE BYTE (color + bank select)
1 TILE BYTE

there is a BYTESWAP at the output of ROM GFX plus
a funny use of clock in the RASTER ROW.

I have attached a DUMP of the videoram and the schematic
if someone can help me.

thanks

Yves






Entire thread
Subject Posted by Posted on
* video tilemap problem yves 04/06/12 03:41 AM
. * Re: video tilemap problem Heihachi_73  04/06/12 11:38 AM
. * Re: video tilemap problem Robbbert  04/06/12 06:54 AM
. * Re: video tilemap problem yves  04/06/12 04:13 PM

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