Difference between revisions of "AMOS:Screenbase structure"
Lonewolf10 (talk | contribs) (Added more info and adjusted page layout slightly.) |
Lonewolf10 (talk | contribs) (More info added.) |
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$40 | Bitplane 4 | $40 | Bitplane 4 | ||
$44 | Bitplane 5 | $44 | Bitplane 5 | ||
| − | $48 | | + | $48 | Bitplane control - misc. control bits (value of BPLCON0) |
| − | $4A | | + | $4A | Bitplane control - screen mode setting (value of BPLCON2) |
| − | $4C | Width | + | $4C | Screen Width |
| − | $4E | Height | + | $4E | Screen Height |
| − | $50 | Depth | + | $50 | Depth (no. of bitplanes) |
$52 | X hardware display position | $52 | X hardware display position | ||
$54 | Y hardware display position + $1000 | $54 | Y hardware display position + $1000 | ||
| Line 42: | Line 42: | ||
$5A | X screen offset | $5A | X screen offset | ||
$5C | Y screen offset | $5C | Y screen offset | ||
| − | $5E | | + | $5E | Number of colors |
| − | $62 | | + | $62 | Color 0 |
| − | $64 | | + | $64 | Color 1 |
| − | $66 | Color | + | $66 | Color 2 |
| − | $68 | Color | + | $68 | Color 3 |
| − | $6A | Color | + | $6A | Color 4 |
| − | $6C | Color | + | $6C | Color 5 |
| − | $6E | Color | + | $6E | Color 6 |
| − | $70 | Color | + | $70 | Color 7 |
| − | $72 | Color | + | $72 | Color 8 |
| − | $74 | Color | + | $74 | Color 9 |
| − | $76 | Color | + | $76 | Color 10 |
| − | $78 | Color | + | $78 | Color 11 |
| − | $7A | Color | + | $7A | Color 12 |
| − | $7C | Color | + | $7C | Color 13 |
| − | $7E | Color | + | $7E | Color 14 |
| − | + | $80 | Color 15 | |
| − | $ | + | $82 | Color 16 |
| − | $ | + | $84 | Color 17 |
| + | $86 | Color 18 | ||
| + | $88 | Color 19 | ||
| + | $8A | Color 20 | ||
| + | $8C | Color 21 | ||
| + | $8E | Color 22 | ||
| + | $90 | Color 23 | ||
| + | $92 | Color 24 | ||
| + | $94 | Color 25 | ||
| + | $96 | Color 26 | ||
| + | $98 | Color 27 | ||
| + | $9A | Color 28 | ||
| + | $9C | Color 29 | ||
| + | $9E | Color 30 | ||
| + | $A0 | Color 31 | ||
| + | $A2 | ??? | ||
| + | $A4 | ??? | ||
| + | $A6 | Byte count per bitplane | ||
$AA | ??? | $AA | ??? | ||
| − | $AE | Last pixel on line | + | $AE | Last pixel on line |
| − | $B0 | Last line of screen | + | $B0 | Last line of screen |
$B2 | BPL1MOD & BPL2MOD value | $B2 | BPL1MOD & BPL2MOD value | ||
$B4 | ??? | $B4 | ??? | ||
| − | $B6 | Dual Screen setting (yes=7, no=0) | + | $B6 | Dual Screen setting (yes=$7, no=$0) |
| − | $B8 | | + | $B8 | 1st pixel (in hardware co-ord) +1 |
| − | $BA | | + | $BA | Screen width (low-res pixels) |
$BC | Screen number | $BC | Screen number | ||
$BE | Autoback setting | $BE | Autoback setting | ||
</pre></code> | </pre></code> | ||
Revision as of 23:16, 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 | Bitplane control - misc. control bits (value of BPLCON0)
$4A | Bitplane control - screen mode setting (value of BPLCON2)
$4C | Screen Width
$4E | Screen Height
$50 | Depth (no. of bitplanes)
$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 | Number of colors
$62 | Color 0
$64 | Color 1
$66 | Color 2
$68 | Color 3
$6A | Color 4
$6C | Color 5
$6E | Color 6
$70 | Color 7
$72 | Color 8
$74 | Color 9
$76 | Color 10
$78 | Color 11
$7A | Color 12
$7C | Color 13
$7E | Color 14
$80 | Color 15
$82 | Color 16
$84 | Color 17
$86 | Color 18
$88 | Color 19
$8A | Color 20
$8C | Color 21
$8E | Color 22
$90 | Color 23
$92 | Color 24
$94 | Color 25
$96 | Color 26
$98 | Color 27
$9A | Color 28
$9C | Color 29
$9E | Color 30
$A0 | Color 31
$A2 | ???
$A4 | ???
$A6 | Byte count per bitplane
$AA | ???
$AE | Last pixel on line
$B0 | Last line of screen
$B2 | BPL1MOD & BPL2MOD value
$B4 | ???
$B6 | Dual Screen setting (yes=$7, no=$0)
$B8 | 1st pixel (in hardware co-ord) +1
$BA | Screen width (low-res pixels)
$BC | Screen number
$BE | Autoback setting
