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ATani
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SG-1000(3000) question(s)
Post Posted: Mon Jan 24, 2000 3:21 am
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
 
  • Joined: 24 Jun 1999
  • Posts: 1732
  • Location: Paris, France
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Post Posted: Fri Jan 28, 2000 5:39 am
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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Post Posted: Fri Jan 28, 2000 5:52 am
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> 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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