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pvmpkin

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Posts posted by pvmpkin

  1. 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

  4. 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 !

  6. 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 ?

  7. 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.

  8. 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

  9. 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.

  12. 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 !

  13. 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.

  22. Posted

    1 minute ago, splendidnut said:

    Well, you do know that the colors will vary from console to console and from TV to TV right?  NTSC = Never The Same Color :)

    but between emulators, and this different ?

    Just now, splendidnut said:

    Also looks like you have timing issues (or something more elusive) going on with the numbers in the upper left.

    there's a colour cycle happening there, that's intentional.

  23. Posted

    Here are some comparison images from Legacy of the Beast.

    OpenEMU seems to use Stella core yet seems wildly different from Stella's standard. The stream from last night also used Stella but has a closer palette to OpenEMU or Javatari

     

    this is maddening to me.

    stream.png

    stella standard.png

    stella z26 .png

    open emu.png

    javatari.png

  24. Posted

    Hey

     

    Huge thank you to @ZeroPage Homebrew for demoing my game Legacy of the Beast last night, especially with so many other games out there, it means a great deal to me.

     

    Something that came up though is that there are some issues with it running on actual hardware. I tested the game in 3 different emulators. Of course emulators are no substitute for hardware but I was quite surprised to see this.

     

    Is there anything specific about why there would be problems, and any way to prevent or diagnose these issues ?

    I read somewhere that there was a compatibility issue with Harmony cartridges but only for games that used some bank-switching techniques ? My game is standard 4K though.

    • Like 2
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