ATani
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SG-1000(3000) question(s)
Posted: Mon Jan 24, 2000 3:21 am
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Zoop,
1) In the sg1000.txt file i see the Video mode is a 5 bit number, are there actually only 3 modes used or is there something i am missing in this?
2) What shows up in Mode 0 ?
3) Sprites, "3 + (n * 4) : Bits 0 to 3 = Color. If color is 0, don't display the sprite. When bit 7 is set, shift sprite by 8 pixels.", which direction do you shift the sprite 8 pixels ?
4) Tiles, are all 8 bytes of a tile stored as follows:
[Tile_Base_Address][<0><1><2><3><4><5><6><7>]=Tile 0
[Tile_Base_Address+8][<0><1><2><3><4><5><6><7>]=Tile 1
... etc...
5) Any docs on the PSG?
Atani
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- Joined: 24 Jun 1999
- Posts: 1732
- Location: Paris, France
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Posted: Fri Jan 28, 2000 5:39 am
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Quote > 1) In the sg1000.txt file i see the Video mode is a 5 bit number, are there actually only 3 modes used or is there something i am missing in this?
There are other modes but SG-1000 games only uses 1 and 2
Quote > 2) What shows up in Mode 0 ?
It's a text mode. Used by Sega Basic on SC-3000, etc..
Quote > 3) Sprites, "3 + (n * 4) : Bits 0 to 3 = Color. If color is 0, don't display the sprite. When bit 7 is set, shift sprite by 8 pixels.", which direction do you shift the sprite 8 pixels ?
To the left. You could have guessed, it would be useless if shifting to the right :)
Quote > 4) Tiles, are all 8 bytes of a tile stored as follows:
> [Tile_Base_Address][<0><1><2><3><4><5><6><7>]=Tile 0
> [Tile_Base_Address+8][<0><1><2><3><4><5><6><7>]=Tile 1
> ... etc...
Is there a question to answer here? ^_^
Beside, I don't have everything in mind right now (i'm not at home)
Quote > 5) Any docs on the PSG?
It is a SN76496.
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ATani
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Posted: Fri Jan 28, 2000 5:52 am
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Quote > To the left. You could have guessed, it would be useless if shifting to the right :)
That is what i thought but i figured i should ask just to be sure.
Quote > > 4) Tiles, are all 8 bytes of a tile stored as follows:
> > [Tile_Base_Address][<0><1><2><3><4><5><6><7>]=Tile 0
> > [Tile_Base_Address+8][<0><1><2><3><4><5><6><7>]=Tile 1
> > ... etc...
> Is there a question to answer here? ^_^
> Beside, I don't have everything in mind right now (i'm not at home)
I think i forgot to put it there.. oh well :)
Quote > > 5) Any docs on the PSG?
> It is a SN76496.
Thanks :)
ATani
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