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trip6
Account closed
Registered: Jan 2007
Posts: 51 |
Berzek for C64
Hello... I recently recieved assembler source code for Berzerk video game. I was told that I would have to use CCS65 to compile it. However, I am quickly realizing that I have no idea how to do this in CCS65. Can some one help me our compile this for me with CCS65 if I sent the source code? All help is appreciated, I'd love to get a port of this classic on the C64.
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
Koesz Oswald,
at a first glance it looks good. let me fire up my dev kit and see what happens... ;)
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
Oswald... well.. at least it draws the first room... ;) but the horizontal lines are not put perfect on screen
http://www.atariage.com/forums/index.php?showtopic=131873&st=0&..
btw. can i send you the DASM file so you can play around?
if so...to which email adress?
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
here is the bug free version:
lL9A59: stx lllll+1
lda $A3
sta $9C
lL9A5D: clc
lda $9C
asl
bcs lL9A6E
adc #$D0
sta $9E
lda #$10
adc #$00
jmp lL9A77
; ----------------------------------------------------------------------------
lL9A6E: clc
adc #$D0
sta $9E
lda #$10
adc #$01
lL9A77: sta $9F
ldy #$00
clc
ldx $a0 ;
lda ($9E),y
adc mul8lo,x ;
sta $8B,y
iny
lda ($9E),y
adc mul8hi,x ;
sta $8B,y
ldx $A1
lda mul8lo,x ;
clc ;
adc $8b ;
sta $8b ;
lda mul8hi,x ;
adc $8c ;
sta $8c ;
lda $8b
sec
sbc #$08
sta $8b
bcs *+4
dec $8c
lda $A5
dex
ldy #0
ora ($8B),y
sta ($8B),y
lda $8b
sec
sbc #$08
sta $8b
bcs *+4
dec $8c
dex
bmi Ll9AA6
beq Ll9AA0
Ll9A9B: lda $A4
sta ($8B),y
lda $8b
sec
sbc #$08
sta $8b
bcs *+4
dec $8c
;
dex
bne Ll9A9B
Ll9AA0: lda $A6
ora ($8B),y
sta ($8B),y
Ll9AA6: lda $9C
clc
adc #$01
sta $9C
cmp L00A2
bcc llll
beq llll
lllll ldx #0
rts
llll jmp lL9A5D
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Oswald
Registered: Apr 2002
Posts: 5026 |
what caused the bug? remember such forum code posts are "from the top of my head" stuff, not granted to work, but a guideline :) happy to see you got it right afterall.
edit: btw in the sprite routines you wont get away with such patches, imho they have to be optimized for speed, and the c64 bitmap format will be painful :) |
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
the sprite routines will be replaced... ;) i am 100% sure that these one can be optimised little bit... ;) even when running in c64 bitmap mode:
;set robots on screen
;soft sprite handling
L8716: lda $183A ; 8716 AD 3A 18 .:.
beq L872A ; 8719 F0 0F ..
sta $8F ; 871B 85 8F ..
ldx #$01 ; 871D A2 01 ..
stx $86 ; 871F 86 86 ..
dex ; 8721 CA .
clc ; 8722 18 .
L8723: jsr L872F ; 8723 20 2F 87 /.
dec $8F ; 8726 C6 8F ..
bne L8723 ; 8728 D0 F9 ..
L872A: lda #$00 ; 872A A9 00 ..
sta $86 ; 872C 85 86 ..
rts ; 872E 60 `
; ----------------------------------------------------------------------------
L872F: lda $0F00,x ; 872F BD 00 0F ...
sta $9C ; 8732 85 9C ..
lda $0F01,x ; 8734 BD 01 0F ...
sta $9D ; 8737 85 9D ..
lda $0F02,x ; 8739 BD 02 0F ...
sta $9E ; 873C 85 9E ..
lda $0F03,x ; 873E BD 03 0F ...
sta $9F ; 8741 85 9F ..
lda $0F04,x ; 8743 BD 04 0F ...
sta $8B ; 8746 85 8B ..
lda $0F05,x ; 8748 BD 05 0F ...
sta $8C ; 874B 85 8C ..
lda $0F06,x ; 874D BD 06 0F ...
sta $A0 ; 8750 85 A0 ..
asl ; 8752 0A .
sta L00A2 ; 8753 85 A2 ..
txa ; 8755 8A .
clc ; 8756 18 .
adc #$07 ; 8757 69 07 i.
sta $FF ; 8759 85 FF ..
lda #$09 ; 875B A9 09 ..
sbc L00A2 ; 875D E5 A2 ..
sta $A3 ; 875F 85 A3 ..
ldy #$00 ; 8761 A0 00 ..
L8763: lda ($8B),y ; 8763 B1 8B ..
sta $8D ; 8765 85 8D ..
iny ; 8767 C8 .
lda ($8B),y ; 8768 B1 8B ..
sta $8E ; 876A 85 8E ..
sty $A1 ; 876C 84 A1 ..
ldy $9C ; 876E A4 9C ..
dey ; 8770 88 .
sty $A5 ; 8771 84 A5 ..
sty $A6 ; 8773 84 A6 ..
L8775: ldy $A5 ; 8775 A4 A5 ..
lda ($9E),y ; 8777 B1 9E ..
sta $A4 ; 8779 85 A4 ..
ldx L00A2 ; 877B A6 A2 ..
beq L8794 ; 877D F0 15 ..
ldx $A3 ; 877F A6 A3 ..
L8781: asl ; 8781 0A .
dex ; 8782 CA .
bne L8781 ; 8783 D0 FC ..
ldy $A6 ; 8785 A4 A6 ..
iny ; 8787 C8 .
eor ($8D),y ; 8788 51 8D Q.
sta ($8D),y ; 878A 91 8D ..
lda $A4 ; 878C A5 A4 ..
ldx L00A2 ; 878E A6 A2 ..
L8790: lsr ; 8790 4A J
dex ; 8791 CA .
bne L8790 ; 8792 D0 FC ..
L8794: ldy $A6 ; 8794 A4 A6 ..
eor ($8D),y ; 8796 51 8D Q.
sta ($8D),y ; 8798 91 8D ..
dec $A6 ; 879A C6 A6 ..
dec $A5 ; 879C C6 A5 ..
bpl L8775 ; 879E 10 D5 ..
dec $9D ; 87A0 C6 9D ..
beq L87B1 ; 87A2 F0 0D ..
clc ; 87A4 18 .
lda $9C ; 87A5 A5 9C ..
adc $9E ; 87A7 65 9E e.
sta $9E ; 87A9 85 9E ..
ldy $A1 ; 87AB A4 A1 ..
iny ; 87AD C8 .
jmp L8763 ; 87AE 4C 63 87 Lc.
; ----------------------------------------------------------------------------
L87B1: ldx $FF ; 87B1 A6 FF ..
rts ; 87B3 60 `
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
Quote: what caused the bug? remember such forum code posts are "from the top of my head" stuff, not granted to work, but a guideline :) happy to see you got it right afterall.
edit: btw in the sprite routines you wont get away with such patches, imho they have to be optimized for speed, and the c64 bitmap format will be painful :)
loading the byte to put on screen was put before the sec-macro so it trashed the accu therefor put garbage on screen.
the x-register needs to be rescued and as you have already written... y-register must stay #0 and we need to use the x-reg for counting instead.
so nothing major issues... ;)
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
well... the sprite routine seems a little bit more tricky. the screen calculations are done somewhere else and i need to find the table setting for the sprites before I change the code...
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Martin Piper
Registered: Nov 2007
Posts: 645 |
Woo definitely getting there. :)
I'd be tempted to find out where the monster/player/bullet positions are stored and using them directly for hardware sprites with a multiplexor.
The tricky thing with that is the pixel accurate collision detection. On a real C64 it's not a big problem (the collision registers can be read during the multiplexor) but some emulators have distinct problems with accurate collision registers. |
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Heaven
Account closed
Registered: Jul 2008
Posts: 102 |
you want to spread your 48 sprite multiplexor... ;)
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Oswald
Registered: Apr 2002
Posts: 5026 |
I'd go for soft sprites. |
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