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Bill Lange

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Posts posted by Bill Lange

  2. Posted

    Ok, here is all of Atari Roots except Appendix A. Let me know what you guys think.

     

    I am know in the processes of converting all the example programs to Dasm/Atari800Win PLus.

     

    www.langesite.com/AtariRoots

     

    WRL

  7. Posted

    I've been updating Atari Roots, an Atari assembly language book from circa 1983, to include examples for DASM/ Atari800Win PLus.

     

    For example, I took the following program from chapter 9, which was for the Atari Assembler Editor cartridge. I fixed the errors in line 160 and 190 (the Atari assembler can not assemble a line with just a lable on it) -

     

    10; THE ATARI RAINBOW

20; RAINBOW.SRC

30;

40 COLRBK=$2C8; THE GRAPHICS 0 BORDER COLOR REGISTER

50 TMPCLR=$C0; A PLACE TO STORE COLORS TEMPORARILY

60;

70  *=$0600

80;

90 START LDA #$FE; MAX COLOR VALUE

0100  STA TMPCLR

0110;

0120 NEWCLR LDA TMPCLR

0130  STA COLRBK

0140;

0150  LDX #$FF

0160 LOOPA NOP; JUST A DELAY LOOP

0170;

0180  LDY #$30

0190 LOOPB NOP; ANOTHER DELAY LOOP

0200  DEY; DECREMENT Y REGISTER

0210  BNE LOOPB

0220;

0230  DEX; DECREMENT X REGISTER

0240  BNE LOOPA

0250;

0260  DEC TMPCLR; DCREMENT TMPCLR

0270  DEC TMPCLR; SUBTRACT 2 FOR NEXT COLOR

0280  BNE NEWCLR; IF NOT ZERO, CHANGE COLORS AGAIN

0290;

0300  JMP START; ALL COLORS DISPLAYED - NOW DO 'EM ALL AGAIN

     

     

    and modified it for DASM

     

    ; The Atari Rainbow
; rainbow.das
; compile with DASM
; dasm rainbow.das -f3 -orainbow.bin
; attach resulting .BIN file as a cartridge in the Atari800Win Plus Emulator



       processor 6502; must be seven space before this line



COLRBK equ $2C8; THE GRAPHICS 0 BORDER COLOR REGISTER

TMPCLR equ $C0; A PLACE TO STORE COLORS TEMPORARILY



 ORG $A000



 CLD; clear the decimal flag

 CLC; clear the carry flag



START LDA #$FE; MAX COLOR VALUE

 STA TMPCLR



NEWCLR LDA TMPCLR

 STA COLRBK



 LDX #$FF

LOOPA NOP; JUST A DELAY LOOP



 LDY #$30

LOOPB NOP; ANOTHER DELAY LOOP

 DEY; DECREMENT Y REGISTER

 BNE LOOPB

 DEX; DECREMENT X REGISTER

 BNE LOOPA



 DEC TMPCLR; DECREMENT TMPCLR

 DEC TMPCLR; SUBTRACT 2 FOR NEXT COLOR

 BNE NEWCLR; IF NOT ZERO, CHANGE COLORS AGAIN



 JMP START; ALL COLORS DISPLAYED - START OVER



 ORG $BFFA

 .byte $00; $BFFA starting address low byte

 .byte $A0; $BFFB starting address high byte

 .byte $00; $BFFC cartridge present byte must be zero

 .byte $02; $BFFD cartridge flag byte - bits 0,2 and 7 are significant

 .byte $00; $BFFE init address low byte

 .byte $A0; $BFFF init address high byte

     

    I've also showed how to use the Monitor in the Atari800Win Plus instead of the DEBUG mode of the Atari Assembler Editor cart.

     

    Is there any interest in seeing this?

     

    WRL

  19. Posted

    look here

     

    www.langesite.com/Atari/index.html

    or try

    67.40.45.140/Atari/index.html

     

    at the bottom of the page.

     

    The file is scans of all 34 pages of the manual. It is 8 megs so i hope you are not using a dial up! :-)

     

    Let me know if you have problems.

     

    WRL

  25. Posted

    Has anyone written a world or terrain building algorithm like the ones used in Seven Cities Of Gold or SimCity?

     

    Chris Crawford, the designer of Eastern Front, has some nice documents on it on his website, but in his words, it is alot of "hand waving".

     

    Here is the link to the World Building info on his site -

    http://www.erasmatazz.com/library/JCGD_Vol...ld_a_World.html

     

    He has a lot of good game design info on his site.

     

    WRL

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