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Forums > C64 Coding > Show Koala Pic
2014-11-09 19:57
Ejner

Registered: Oct 2012
Posts: 43
Show Koala Pic

I'm sure noone here has any problems with showing a simple Koala picture, but I came across this piece of code on codebase64.org and wondered why this had to be done so complicated...?

http://codebase64.org/doku.php?id=base:calculate_vic_settings_f..

In TurboAssembler it's pretty simple to calculate the VIC settings, see my example below. Isn't something similar possible with KickAssembler? Just wondering...

Example in TurboAssembler:

;---------------------------------------
;        Show Koala
;---------------------------------------
koala    = $6000
screen   = $5c00
;---------------------------------------
bank     = koala/$4000

         *= $1000

         lda #$3b
         sta $d011
         lda #koala-($4000*bank)/1024
         ora #(screen-($4000*bank))/64
         sta $d018
         lda #$d8
         sta $d016
         lda $dd02
         ora #%00000011
         sta $dd02
         lda $dd00
         and #%11111100
         ora #3-bank
         sta $dd00

         ldx #0
copy     lda koala+$1f40,x
         sta screen,x
         lda koala+$2040,x
         sta screen+$0100,x
         lda koala+$2140,x
         sta screen+$0200,x
         lda koala+$2228,x
         sta screen+$02e8,x
         lda koala+$2328,x
         sta $d800,x
         lda koala+$2428,x
         sta $d900,x
         lda koala+$2528,x
         sta $da00,x
         lda koala+$2610,x
         sta $dae8,x
         inx
         bne copy
         lda koala+$2710
         sta $d021
         lsr a
         lsr a
         lsr a
         lsr a
         sta $d020

         lda #0
         cmp $0277     ;wait for key
         bne *-3

         lda $dd02
         ora #%00000011
         sta $dd02
         lda $dd00
         and #%11111100
         ora #%00000011
         sta $dd00
         lda #$1b
         sta $d011
         lda #$15
         sta $d018
         lda #$c8
         sta $d016

         jmp $9000
;---------------------------------------

Note: The result of "bank = koala/$4000" is an integer.
 
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2015-09-22 11:55
Smasher

Registered: Feb 2003
Posts: 520
Oswald, I think you cheated... that's drazlace :)
so lemme check aswell: FLI with fli-bug on!

2015-09-22 11:57
Bitbreaker

Registered: Oct 2002
Posts: 508
Quoting SIDWAVE

lda $dd00
and #%11111100
ora #%00000011
sta $dd00


This might break with elite loaders active.
Also, why storing #$19 in $d018?
Where to copy the colram?
Where is $d021 set?
...
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