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Entry posted by Wickeycolumbus July 31, 2007

421 views

hello again!

I have been doing more 2600 programming and have greatly inproved. I made my first arysmatical playfield!(or however you spell it) It is a square box arround the screen. there is one slight problem tho. at the top, there is a mistack where the sides of the wall begin (someone, please help!). enjoy!

source:

processor 6502

include "vcs.h"

include "macro.h"

org $F000

Reset

LDA #0

TAX

RAMCLR

STA 0,X

INX

BNE RAMCLR

STARTOFFRAME

LDA #0

STA VBLANK

LDA #2

STA VSYNC

STA WSYNC

LDA #0

STA VSYNC

LDA #$00

STA COLUBK

LDA #$60

STA COLUPF

LDX #0

VERT

INX

STA WSYNC

CPX #37

BNE VERT

LDX #0

PIC

LDA #$00

STA COLUBK

EIGHT

INX

LDA #%11111111

STA PF0

LDA #%11111111

STA PF1

LDA #%11111111

STA PF2

STA WSYNC

CPX #8

BNE EIGHT

LDA #000000

STA PF1

STA PF2

LDX #0

REST

INX

LDA #$A9

STA COLUBK

LDA #000000

STA PF2

LDA #010000

STA PF0

NOP

LDA #000000

STA PF0

LDA #%10000000

NOP

STA PF2

STA WSYNC

CPX #176

BNE REST

LDA #000000

STA PF0

STA PF2

LDX #0

EIGHTO

INX

LDA #%11111111

STA PF0

STA PF1

STA PF2

STA WSYNC

CPX #8

BNE EIGHTO

LDA #000000

STA PF0

STA PF1

STA PF2

LDA #$00

STA COLUBK

STA WSYNC

LDX #0

OVER

INX

STA WSYNC

CPX #29

BNE OVER

JMP STARTOFFRAME

org $FFFA

.word Reset

1 Comment

Recommended Comments

SpiceWare 8,904

Posted July 31, 2007

You'll want to put

 (remove the space after both e's) around your source code else the leading spaces disappear and cause all sorts of problems in DASM.

[code]   processor 6502
  include "vcs.h"
  include "macro.h"

  org $F000
Reset
  LDA #0
  TAX
RAMCLR
  STA 0,X
  INX
  BNE RAMCLR

Alternatively, include the source as an attachment.