Difference between revisions of "AMOS:Screenbase structure"
Spellcoder (talk | contribs) (email from AMOS-list (1993) about the structure at Screen Base) |
Lonewolf10 (talk | contribs) (Added more info and adjusted page layout slightly.) |
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| − | + | ==Sources== | |
| − | + | ||
| − | + | Andrew D. Burton and Andy Church (email dated: 26 May 93 19:56:00 EST, from: Andrew Church <95ACHURCH@vax.mbhs.edu>, with subject: Re: Screen Base) | |
| − | + | ||
| − | + | ||
| − | + | ==Structure== | |
| − | about the Screen Base structure: | + | |
| + | Here's all that we've been able to find out about the Screen Base structure: | ||
<code><pre> | <code><pre> | ||
| Line 29: | Line 30: | ||
$44 | Bitplane 5 | $44 | Bitplane 5 | ||
$48 | Screen mode (value of BPLCON0 custom chip register) | $48 | Screen mode (value of BPLCON0 custom chip register) | ||
| − | $4A | ??? | + | $4A | ??? (value of BPLCON2 custom chip register) |
$4C | Width | $4C | Width | ||
$4E | Height | $4E | Height | ||
| Line 42: | Line 43: | ||
$5C | Y screen offset | $5C | Y screen offset | ||
$5E | ??? | $5E | ??? | ||
| − | |||
$62 | ??? | $62 | ??? | ||
$64 | Number of colors in screen (2^Depth) | $64 | Number of colors in screen (2^Depth) | ||
$66 | Color 0 | $66 | Color 0 | ||
$68 | Color 1 | $68 | Color 1 | ||
| − | + | $6A | Color 2 | |
| + | $6C | Color 3 | ||
| + | $6E | Color 4 | ||
| + | $70 | Color 5 | ||
| + | $72 | Color 6 | ||
| + | $74 | Color 7 | ||
| + | $76 | Color 8 | ||
| + | $78 | Color 9 | ||
| + | $7A | Color 10 | ||
| + | $7C | Color 11 | ||
| + | $7E | Color 12 | ||
: | : | : | : | ||
$A4 | Color 31 | $A4 | Color 31 | ||
| + | $A6 | ??? | ||
| + | $AA | ??? | ||
| + | $AE | Last pixel on line (for copperlist?) | ||
| + | $B0 | Last line of screen (for copperlist?) | ||
| + | $B2 | BPL1MOD & BPL2MOD value | ||
| + | $B4 | ??? | ||
| + | $B6 | Dual Screen setting (yes=7, no=0) | ||
| + | $B8 | ??? | ||
| + | $BA | ??? | ||
| + | $BC | Screen number | ||
| + | $BE | Autoback setting | ||
</pre></code> | </pre></code> | ||
| − | |||
| − | |||
Revision as of 00:42, 19 July 2008
Sources
Andrew D. Burton and Andy Church (email dated: 26 May 93 19:56:00 EST, from: Andrew Church <95ACHURCH@vax.mbhs.edu>, with subject: Re: Screen Base)
Structure
Here's all that we've been able to find out about the Screen Base structure:
Ofs | Item
----+-----------------------------------------------------
$00 | Bitplane 0 (active buffer of double-buffered screen)
$04 | Bitplane 1
$08 | Bitplane 2
$0C | Bitplane 3
$10 | Bitplane 4
$14 | Bitplane 5
$18 | Bitplane 0 (first buffer)
$1C | Bitplane 1
$20 | Bitplane 2
$24 | Bitplane 3
$28 | Bitplane 4
$2C | Bitplane 5
$30 | Bitplane 0 (second buffer)
$34 | Bitplane 1
$38 | Bitplane 2
$3C | Bitplane 3
$40 | Bitplane 4
$44 | Bitplane 5
$48 | Screen mode (value of BPLCON0 custom chip register)
$4A | ??? (value of BPLCON2 custom chip register)
$4C | Width
$4E | Height
$50 | Depth
$52 | X hardware display position
$54 | Y hardware display position + $1000
| (actual position = Deek(Screen Base+$54)-$1000
$56 | Width of displayed area of screen in low-res pixels
| (2 hi-res pixels for each low-res pixel)
$58 | Height of displayed area of screen
$5A | X screen offset
$5C | Y screen offset
$5E | ???
$62 | ???
$64 | Number of colors in screen (2^Depth)
$66 | Color 0
$68 | Color 1
$6A | Color 2
$6C | Color 3
$6E | Color 4
$70 | Color 5
$72 | Color 6
$74 | Color 7
$76 | Color 8
$78 | Color 9
$7A | Color 10
$7C | Color 11
$7E | Color 12
: | :
$A4 | Color 31
$A6 | ???
$AA | ???
$AE | Last pixel on line (for copperlist?)
$B0 | Last line of screen (for copperlist?)
$B2 | BPL1MOD & BPL2MOD value
$B4 | ???
$B6 | Dual Screen setting (yes=7, no=0)
$B8 | ???
$BA | ???
$BC | Screen number
$BE | Autoback setting
