.btye value storage question

[SavedByZero]

This may seem like a minor hangup, but I'm trying to learn why this code block does NOT properly store the value #5 inside YPOS:

	processor 6502
        include "vcs.h"
        include "macro.h"
        include "xmacro.h"


        org $f000
YPos .byte
BGColor equ $81
counter equ #0
SpriteHeight equ 9
TooLow equ 5

	
Start
	CLEAN_START

NextFrame

	lda #2      ; turn VBLANK on
        sta VBLANK  ; 
        sta VSYNC   ; turn VSYNC on
	sta WSYNC
        sta WSYNC
        sta WSYNC
        lda #0         ; turn VSYNC off 
        sta VSYNC      ;
        
        ldx #37 
LVBlank
	sta WSYNC
        dex 
        bne LVBlank
        lda #0        ;  turn VBLANK off
        sta VBLANK    ;

        ldx #192
        ;ldy counter
        lda #5
  	sta YPos

 

and this one DOES store it properly:

	processor 6502
        include "vcs.h"
        include "macro.h"
        seg.u variables
        include "xmacro.h"
	org $80
YPos .byte
	seg code
        org $f000

BGColor equ $81
counter equ #0
SpriteHeight equ 9
TooLow equ 5

	
Start
	CLEAN_START

NextFrame

	lda #2      ; turn VBLANK on
        sta VBLANK  ; 
        sta VSYNC   ; turn VSYNC on
	sta WSYNC
        sta WSYNC
        sta WSYNC
        lda #0         ; turn VSYNC off 
        sta VSYNC      ;
        
        ldx #37 
LVBlank
	sta WSYNC
        dex 
        bne LVBlank
        lda #0        ;  turn VBLANK off
        sta VBLANK    ;

        ldx #192
        ;ldy counter
        lda #5
  	sta YPos

 

The only thing I do differently in part 2, thanks to easmith's help, is that "org $80" section and import of seg.u variables. 

Unfortunately the chapter I'm up to in the "Making Games For..." book (8) is not at the point where it explains this, or where to put its sample snippets of code.

 

[easmith]

the variables section is the RAM, which  you can read from and write to  .  The code section is ROM which can not be written to .   All variables must be defined in RAM which is $80 to $FF in memory

[SavedByZero]

3 hours ago, easmith said:

the variables section is the RAM, which  you can read from and write to  .  The code section is ROM which can not be written to .   All variables must be defined in RAM which is $80 to $FF in memory

Now *that* makes sense...