X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=snes_test1;a=blobdiff_plain;f=test.asm;h=15d23a3c0d0adcb3a92987a7b737303ba350787e;hp=da5f5ec5a91f6bf1f016b2da1c81b89710dca0fb;hb=HEAD;hpb=6b4a9266e17c7fa3f54d0492c4a01b44fc5d3fe0

diff --git a/test.asm b/test.asm
index da5f5ec..15d23a3 100644
--- 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