Hi there! I've been trying to code a demo using NESASM that displays a mario 16x16 object using 8x8 sprites on the screen. Everything works fine except for
some reason I can't seem to align the sprites correctly on screen. I've tried many different X-Y coordinates to display the sprites but to no resolution. Here is a small snippet of the code that isn't working right...

lda #$09 ;|\__ turn off sprite
sta $2001 ;|/

lda #$00 ;|\__ set the address in SPR-RAM
sta $2003 ;|/

; draw all the sprites to make up a little mario object

lda #$10 ;y
stx $2004
ldx #$00 ;sprite pattern number
stx $2004
ldx #%00000000 ;color bit
stx $2004
ldx #$08 ;x
stx $2004

lda #$10 ;y
stx $2004
ldx #$01 ;sprite pattern number
stx $2004
ldx #%00000000 ;color bit
stx $2004
ldx #$0F ;x
stx $2004

lda #$19 ;|\__ turn on sprite
sta $2001 ;|/

this is just two of the sprites out of the four that should be right next to each other. this code is located in the NMI interupt routine. any ideas. thanks :)