Posts by Natshirt - SMW Central

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Posts by Natshirt

Natshirt's Profile - Posts by Natshirt

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Natshirt
Flopping Cheep-Cheep

Posts: 1/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-05-06 07:24:33 PM in Flower spawning on incorrect tile | Last edited 2020-05-06 07:25:26 PM by Natshirt

I am currently learning asm and want to create a block which always spawns a flower. The only problem is that it spawns one tile to low and to far right (Screenshot). I would like to know why this happens and what I must add to my code.
Its base state is 130

Code

db $42
JMP MarioBelow : JMP MarioAbove : JMP MarioSide
JMP SpriteV : JMP SpriteH : JMP MarioCape : JMP MarioFireball
JMP TopCorner : JMP BodyInside : JMP HeadInside

MarioBelow:
    PHB             ;\
    LDA #$02        ; | change bank register to $02
    PHA             ; |
    PLB             ;/
    LDA #$02        ;\
    STA $05         ; | spawn a flower
    JSL $02887D     ;/
    PLB             ; restore bank register

    LDA #$0D        ;\
    STA $9C         ; | change block to used block
    JSL $00BEB0     ;/
RTL

MarioAbove:
MarioSide:

TopCorner:
BodyInside:
HeadInside:

SpriteV:
SpriteH:

MarioCape:
MarioFireball:
RTL

print "Test"

Natshirt
Flopping Cheep-Cheep

Posts: 2/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-05-06 08:59:47 PM in Flower spawning on incorrect tile

So what tells the sprite where it has to spawn?

I have also read the description for $02887D and cleared $8898 and $889A but it hasn't done anything

Natshirt
Flopping Cheep-Cheep

Posts: 3/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-05-06 10:14:21 PM in Flower spawning on incorrect tile | Last edited 2020-05-07 06:46:24 AM by Natshirt

I have cleared these bits and it works perfectly. Thank you very much for your help^^

Code

MarioBelow:
    LDA $98         ;\
    AND #$F0        ; |
    STA $98         ; | clear lowest bits of $98 and $9A
    LDA $9A         ; |
    AND #$F0        ; |
    STA $9A         ;/

    LDA #$02        ;\ preserve value to spawn flower(02)
    STA $05         ;/
    PHB             ;\
    LDA #$02        ; | change bank register to $02
    PHA             ; |
    PLB             ;/
    JSL $02887D     ; call spawn subroutine
    PLB             ; restore bank register

    LDA #$0D        ;\
    STA $9C         ; | change block to used block
    JSL $00BEB0     ;/
RTL

Natshirt
Flopping Cheep-Cheep

Posts: 4/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-06-12 05:55:32 PM in Slow Conveyor Belt

I have made block, which is moving every sprite and the player one pixel to the right per frame. Here is a snippet how I did it for the sprites and a clip who shows what the bock is doing at the moment:

Code

SpriteV:
    REP #$20        ; set A to 16-bit mode
    LDA #$0001      ;\
    CLC             ; | add 1 to sprite's position
    ADC $E4, X      ; | $E4 contains low byte (position on screen)
    XBA             ; | $14E0 contains high byte (screen number)
    ADC $14E0, X    ;/
    SEP #$20        ; set A to 8-bit mode
    STA $14E0, X    ;\
    XBA             ; | store sprite's new position
    STA $E4, X      ;/
RTL

Now, I want to move the sprites only every second frame to make the conveyor belt slower. I don't know how I can check if the sprite has been moved the frame before or if there are other possibilities to make the belt slower.

Natshirt
Flopping Cheep-Cheep

Posts: 5/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-06-13 06:32:37 AM in Slow Conveyor Belt

Yes, it works and I understand the concept. Thank you very much.

Natshirt
Flopping Cheep-Cheep

Posts: 6/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-08-01 06:03:12 PM in [SOLVED] Custom Block: Blank tile generated on wrong position | Last edited 2020-08-01 06:58:39 PM by Natshirt

I am currently trying to write a block which gets destroyed on contact with a sprite. I am using the subroutine $BEB0 to create a blank tile on the block's position and I am loading the sprite's position into $98-9B (the player's position).
Everything is working out except the fact that the tile gets always created on the left from the sprite.
Is there a way to detect if the sprite touches the left or right side of the block or is there a different way to destroy the block?

Here is the my code (I have left out the block where the player's position is pushed into the stack and pulled from the stack)

Code

    LDA $14D4, X    ;\
    XBA             ; |
    LDA $D8, X      ; | Store sprite Y position
    REP #$20        ; | into player Y position
    STA $98         ; |
    SEP #$20        ;/
    LDA $14E0, X    ;\
    XBA             ; |
    LDA $E4, X      ; | Store sprite X position
    REP #$20        ; | into player X position
    STA $9A         ; |
    SEP #$20        ;/

    LDA #$02        ;\
    STA $9C         ; | Gernerate blank tile
    JSL $BEB0       ;/

Natshirt
Flopping Cheep-Cheep

Posts: 7/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-08-01 06:27:39 PM in [SOLVED] Custom Block: Blank tile generated on wrong position

These were my first lines, but when a sprite touched the block, the tile got generated one tile below the player

Natshirt
Flopping Cheep-Cheep

Posts: 8/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-08-01 06:35:16 PM in [SOLVED] Custom Block: Blank tile generated on wrong position

I don't know either how it should work. I have only written the first three lines, started debugging the game and discovered that $00BEB0 is using the player's position to generate the block

Natshirt
Flopping Cheep-Cheep

Posts: 9/9
Since: 2020-03-18 02:23:19 PM

Last seen: 1 week and 5 days ago

Link
Posted on 2020-08-01 06:46:20 PM in [SOLVED] Custom Block: Blank tile generated on wrong position | Last edited 2020-08-01 06:58:10 PM by Natshirt

Yes, that worked. I have only two additional questions. Where can I find the routines from GPS and can I see the code from these routines?

I have found it, it's in the gps/routines folder. Thank you very much^^

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