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    SOUL OF THE BEAST

    in Atari 2600

    Posted

    21 minutes ago, Electric-Dreams said:

    The box is gorgeous ! Is there any chance to have a PAL version of the cart in the near future?

    Thank you

     

    I have been asked about a PAL release before, so I wrote a bit about it here

     

    SOUL OF THE BEAST

    in Atari 2600

    Posted

    Hi everyone !

     

    I'm happy to say my first Atari 2600 game SOUL OF THE BEAST inspired by the 1989 Amiga classic, is done !

     

    It features more than 15 unique enemy types, variants, and items. Non-linear level design, in a standard 4K NTSC ROM.

     

    I'm hoping to move forward with a cart release and a PAL version.

    https://aeriform.itch.io/beast I hope you check it out !

     

     

    soul.png

    • Like 15
    • Thanks 1

    Legacy of the Beast [WIP]

    in Atari 2600 Programming

    Posted · Edited by pvmpkin

    Hæ everyone !

     

    It took a while but I finally have a version I am happy to call "done". I may tweak little things but everything I intended to implement is in and working.

     

    In this standard 4K ROM I managed to fit 5 areas with non-linear design. More than 15 enemy types and variants, key items, health potions, and importantly something resembling sound.

     

    This has been an absolute labour of love for me, and more than proud of what I have been able to do with no prior experience making Atari games.

     

    I hope you enjoy playing this.

    https://aeriform.itch.io/beast

     

    I'd like to thank everyone that has supported the development of this game, the kind words, and amazing tips on how to optimise and handle certain problems.

     

    • Like 8

    Shadow of the Beast demake experiment

    in Intellivision Programming

    Posted

    2 minutes ago, skywaffle said:

    I haven't done much lately with it.  Most of my time every day has gone back into Intellivania.  Intellivania was done, but I keep going back and revisiting, rewriting, optimizing, and adjusting parts to more closely mimic Castlevania on the NES.  As far as Shadow of the Beast goes, I had made a dungeon map compression that uses groups of 6x6 tiles pieced together, but I had a ways to go with making the first dungeon.

    That's cool, I wondered, it was looking great !

    sprite masking

    in Atari 2600 Programming

    Posted · Edited by pvmpkin

    brilliant, thank you.

     

    I've noticed this a few times: 

    .byte $2c

    You indicate that it skips the next LDA instruction but I don't understand why that is used, the context of it.

     

    OH, I think I see it. It's a way of reusing the store instruction without changing the value right ?

    sprite masking

    in Atari 2600 Programming

    Posted · Edited by pvmpkin

    Hey, does anyone have any suggestions on how best to mask parts of a sprite, to change a certain number of lines—instead of having a separate full sprite ?

     

    *ideally without doing this during the kernel

      

    	lda (objectptr),y
	cpx #5
	bcc .nomask
	and #%11110000
.nomask
	sta GRP1

    I am doing this in the kernel though, and seems to work as intended, but wondering if there is another way.

    Timers/Delays

    in Atari 2600 Programming

    Posted

    Thank you so much for steering me towards this. 

     

    It was suggested to me to subtract the worldpos from $80 and then I was able to count down from $7F and works perfectly.

     

    After rewriting all of the area data it's saved me a lot of ROM space, much less cycle use and I don't get that issue with out of range branches !

     

     

    • Like 1

    Timers/Delays

    in Atari 2600 Programming

    Posted

    hey @Andrew Davie

      

    ;        FOREST RIGHT
ForestRT        subroutine

                lda #1
                sta visible

                lda worldpos
                asl			
                tax

                lda VectorTable,x
                sta zp
                lda VectorTable+1,x
                sta zp+1

                jmp (zp)		

; The table...

VectorTable
                .word .Well
                .word .Gremlin
                .word .None
                .word .Well

.Well:          jsr SetWell
				jmp .Done
.Gremlin:       jsr SetGremlin
				jmp .Done

.None:			ldx #0
				stx type

.Done:          rts

     

    I have this in as a test and it appears to be working from $80 onwards, but I am not seeing how I would count from $7F down, am I missing something glaringly obvious or does this code not work like that ?

     

    also I assumed that the zp value needed to be a .word ? I tried as a byte and that didn't work for me.

    Previous input check

    in Atari 2600 Programming

    Posted 

    MoveRT	subroutine

	lda direction
	cmp #0
	beq .repeat
	lda #0
	sta steps

.repeat
	inc steps
	lda #0
	sta direction
	rts

MoveLT	subroutine	
    lda direction
	cmp #$20
	beq .repeat
	lda #0
	sta steps

.repeat
	inc steps
	lda #$20
	sta direction
	rts

    I friend chimed in with some advice, this seems to be working !

    Previous input check

    in Atari 2600 Programming

    Posted

    Hey everyone,

     

    Is there a way to check if the direction input was the same as the last ? I have a value that needs to reset if it is not.

      

    MoveRT:
	lda direction
	cmp #$20
	beq .Reset
	jmp .Done

MoveLT:
	lda direction
	cmp #0
	beq .Reset
	jmp .Done

.Reset
	lda #0
	sta value
.Done:	rts

    I have a direction facing that switches thanks to advice from @SpiceWare

     

    This is what I am trying to do, but I am missing something.

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