SCREEN:
ln# d012 badl*:  scr:   col:     *$d011=$1b /badline
-----------------------------------------------------
!00  $31   $33   $0400  $d800	logo0_line1 + 6 sprite bg layer
 01  $39   $3b   $0428  $d828	logo0_line2
 02  $41   $43   $0450  $d850	logo0_line3
 03  $49   $4b   $0478  $d878
 04  $51   $53   $04a0  $d8a0   
!05  $59   $5b   $04c8  $d8c8	logo1_line1 + 6 sprite bg layer
 06  $61   $63   $04f0  $d8f0   logo1_line2
 07  $69   $6b   $0518  $d918   logo1_line3
 08  $71   $73   $0540  $d940   
!09  $79   $7b   $0568  $d968   __raster line, 1px, sideborder
 10  $81   $83   $0590  $d990  	text: proudly presents
 11  $89   $8b   $05b8  $d9b8   
!12  $91   $93   $05e0  $d9e0   text: intro-03
 13  $99   $9b   $0608  $da08   
!14  $a1   $a3   $0630  $da30  *1x1 scroll with sprite bg layer
!15  $a9   $ab   $0658  $da58   __raster line, 1px, sideborder
 16  $b1   $b3   $0680  $da80   
!17  $b9   $bb   $06a8  $daa8   logo2_line1 + 6 sprite bg layer
 18  $c1   $c3   $06d0  $dad0   logo2_line2
 19  $c9   $cb   $06f8  $daf8   logo2_line3
 20  $d1   $d3   $0720  $db20  
 21  $d9   $db   $0748  $db48   
!22  $e1   $e3   $0770  $db70  	logo3_line1 + 6 sprite bg layer
 23  $e9   $eb   $0798  $db98   logo3_line2
 24  $f1   $f3   $07c0  $dbc0   logo3_line3
---------------------- 
DATA: C: code, G: graphics, D: data, S: sprites, V/P: value/pointer
*******************************************************************
---------------------------------------------------------------------
d $0800 - 09ff   1x1 charset, char data
d $0a00 - 0bff   1x1 charset, sprite layer data (low and high 4 bits)
s $0e00 - 0fbf   7 sprites for 1x1 scroller ($07f9=$38?)
d $1f00 - 1f05   logo0 sprites: X coordinates
d $1f10 - 1f15   logo1 sprites: X coordinates
d $1f20 - 1f25   logo2 sprites: X coordinates
d $1f30 - 1f35   logo3 sprites: X coordinates
d $1f40 - 1f43   logo left-most char X position pixel offsets, bit 0-2 (for $d016)
d $1f50 - 1f53   logo left-most char X positions (based on $2300 & $1f7x)
d $1f60 - 1f63   logo sprite Y positions (FIX values, logo0,1,2,3)
d $1f70 - 1f73   logo swing/sinus position (0-255, logo0,1,2,3)
d $1f74 - 1f77   logo swing STOP On/Off. 'ON' is 0 (zero!), non-zero value is 'OFF'
d $1f80 - 1f9f   logo colour variations, 8 color sets (from here, will be copied)
d $1fa0 - 1fa2   logo0 sprite colors, $d025, $d026, $d027-$d02c
d $1fa4 - 1fa6   logo1 sprite colors, $d025, $d026, $d027-$d02c
d $1fa8 - 1faa   logo2 sprite colors, $d025, $d026, $d027-$d02c
d $1fac - 1fae   logo3 sprite colors, $d025, $d026, $d027-$d02c
d $1fc0 - 1fc3   logo#0-3 color set indices
g $2000 -        logo charset (25 chars only, 25x8 bytes)
d $2100 -        logo map, 3x40 chars
d $2180 - 218f   brightest color fade-in
d $21a0 -        2nd bringtest   fade-in
d $21c0 -        neutral         fade-in
d $21e0 -        darkest         fade-in
s $2200 -        sprites background for logo, 4 MC sprites ($07f8=$88?)
d $2300 -        logo swing sinus
d $2400 -        logo map colours, 3x40 chars ($06-dark blue, $0e-blue , cv #0)
  $2480 -        logo map colours, 3x40 chars ($02-dark red,  $0a-red  , cv #1)
  $2500 -        logo map colours, 3x40 chars ($0b-dark grey, $0d-green, cv #2)
  $2580 -        logo map colours, 3x40 chars ($06-dark blue, $0f-lgrey, cv #3)
d $2600 -        logo0 colours (copied always from the 4 stored at $2400-25ff)
d $2680 -        logo1 colours  -||-
d $2700 -        logo2 colours  -||-
d $2780 -        logo3 colours  -||-
--
ROUTINES:
c $1a00 -        1x1 scroll colour cycle routine
c $1b20 -        colour fade-in/out change ON at $1b40: 'intro-03' (or prod. txt, later)
c $1b40 -        colour fade-in/out (intro-03' text)
c $1bd0 -        scroll colour cycle every /256 frames
c $1c00 -        logo#0-3 swing: change direction based on snares (music, $c1=$80)
c $2400 - 24ff   color cycling routines for logos (2400, 2440, 2480, 24c0)
c $2720 -        logo#0 fade-in (on: 2721, counter: 2726)
c $2757 -        logo#1 fade-in (on: 2758, counter: 275d)
c $278e -        logo#2 fade-in (on: 278f, counter: 2794)
c $2e00 -        logo#2 fade-in (on: 2e01, counter: 2e06)
c $2800 -        start
c $2a00 -        main routine / raster interrupts
c $2b00 -        1x1 scroll routine: main logic (draw new char+bg sprite char)
c $2c00 -        [subroutine] 1x1 scroll routine: sprite data, move 1 char to left
c $2cc0 -        logo#0-3: colour cycling for all logos
c $2d00 -        1x1 scroll mode init + Sprite bg. layer init
c $2dc0 -        $dc01 / PRESS SPACE logic start
c $3500 -        logo#0 sprite init & X-coordinate calculation
c $3600 -        logo#1 sprite init & X-coordinate calculation
c $3700 -        logo#2 sprite init & X-coordinate calculation
c $3800 -        logo#3 sprite init & X-coordinate calculation
c $3900 -        d012=a9, all sprites OFF!, also sprites #0-5 Y-coord set to $00
c $3910 -        1st 1-pixel rasterline
c $3930 -        2nd 1-pixel rasterline
c $3980 -        logo swing (logo#0-3) [INC: $ee, DEC: $ce, $3980, 83, 86, 89]
c $2500 -        logo#0 draw (speedcode, superfast!: char + colours draw)
c $3b00 -        logo#1 draw
c $3d20 -        logo#2 draw
c $1d00 -        logo#3 draw
--
VARIABLES:
v 2bfe           1x1 scroll: sprite background layer X-pos, bit-3 offset
v 2bff           1x1 scroll: leftmost char (1: low 4 bits, 0: high 4 bits)
v 2d             1x1 scroll: delay counter
v 2e             1x1 scroll: 3-bit decreasing counter, 0-7
v 2f - 30        1x1 scroll: data pointer
v 31 - 32        logo swing: source screen address (fix, $2100)
v 33 - 34        logo swing: target screen address (e.g. $0770)
v 35 - 36        logo swing: source colour address (e.g. $2400)
v 37 - 38        logo swing: target colour address (e.g. $db70)
v 39             temporary value in code $2e00 / logo draw routine for X char pos offset(33
v 41 - 42        1x1 scroll: sprite background copy-paste pointers, source
3e  3c  38  30  20
3657 - 36cf

RUNTIME Plan:
-------------
$2a00 - all main code sections, separated by raster interrupts.
Nr#:  $D012:  $2a00,X:  $D018:  $D016:  $D011: ($D0xx value only, if change is made)
 01    2e        00       $18   =$1f40   $1b   [logo0]
          .1: draw logo1
 02    51        28             =$1f41         [logo1]
          .1: draw logo2
 03    77        4e       $12    #$c8    
       79 .1: 1-pixel D020-D021 rasterline
          .2: sprite init for 'proudly presents' text
 04    87        6b
          .1: sprite init for 'intro-03' text  
       91 .2: 
 05    99        83              =$2e
          .1: 1x1 scroll sprite layer init
       a8 .2: all sprites OFF (note: save rastertime)
       a9 .3: 1-pixel D020-D021 rasterline
 06    ac        a6       $18   =$1f42   $1b
          .1: logo2 6 bg sprites init + colours
          .2: draw logo3
 07    d9        c9             =$1f43
          .1: logo3 6 bg sprites init + colours
          .2: draw logo0
          .3: play music
          .4: swing logo0-3 logic: fill $1f40-43
          .5: determine logo colours (sprites)

colours:
0 - @ - black
1 - a - white
2 - b - red
3 - c - cyan
4 - d - purple
5 - e - green
6 - f - blue
7 - g - yellow
8 - h - orange
9 - i - brown
a - j - light red
b - k - dark grey
c - l - grey
d - m - light green
e - n - light blue
f - o - light grey

Logo swing draw logic: $35-36 set based on LDY, others LDX, code: $2e00.
callig $2e00: set X reg = logo number (0-3). Y reg = colour set (0-3)
       $33   $34   $35   $36   $37   $38   screen   colour
Logo0: 00     04    00    24    00    d8    0400     d800
Logo1: c8     04    80    24    c8    d8    04c8     d8c8
Logo2: a8     06    00    25    a8    da    06a8     daa8
Logo3: 70     07    80    25    70    db    0770     db70
   lda 2100,x  <-- x starts at $10, ends at $1e!!!