fixed comment

diff --git a/test.asm b/test.asm
index da5f5ec..15d23a3 100644 (file)
--- a/test.asm
+++ b/test.asm
@@ -9,7 +9,7 @@
        .segment "code"
 
        ; VMEM map
-       ; 0000: tilemap for BG1 (32x32 4bpp: 512b)
+       ; 0000: tilemap for BG1 (32x32 word tile refs, 2kb)
        ; 2048: BG3-base (h/v offsets)
        ; 8192: tile data (16k)
        vmem_tiles_offs = 4096  ; 4k words
@@ -17,9 +17,11 @@
        vmem_voffs_offs = vmem_hoffs_offs + 32
 
        sei
+       ; get out of 6502 emulation mode
        clc
        xce
 
+       ; initialize stack
        I16
        ldx #$1fff
        txs
@@ -102,9 +104,7 @@ mainloop:
        ldx ncol
        bne @per_tile_offs
        ; global scroll for the first column
-       ;sta REG_BG1VOFS
        sta vscroll
-       ;stz REG_BG1VOFS
        bra @end
 
 @per_tile_offs:
@@ -113,9 +113,6 @@ mainloop:
        asl
        tax     ; x = ncol << 1
        pla
-       ;sta REG_VMDATAL
-       ;lda #$20       ; enable for BG1
-       ;sta REG_VMDATAH
        sta shadow_voffs,x
        inx
        lda #$20
@@ -150,7 +147,7 @@ mainloop:
        A16
        jmp mainloop
 
-       ; copy_vmem(vmem_offset, src, num_words)
+       ; copy_vmem(vmem_offset, src, num_bytes)
 copy_vmem:
        rep #$30        ; 16bit accumulator and index registers
        .a16
@@ -164,7 +161,7 @@ copy_vmem:
        ; $3 return address
        ; $5 vmem_offs
        ; $7 src
-       ; $9 num_words
+       ; $9 num_bytes
 
        lda #$80        ; auto incerment after wiriting high byte
        sta REG_VMAINC