Save a few t-states in loop and clean up numeric literals

xylo.asm

@@ -1,7 +1,7 @@
 org 51000
 
 counter EQU inc_counter + 1
-attrs EQU &5800
+attrs EQU #5800
 xylo EQU attrs + 40
 
 zero_counter:
@@ -11,8 +11,8 @@ set_counter:
 	ld (counter), a
 
 read_keyboard:
-	ld a, &f7
-	in a, (&fe)
+	ld a, #f7
+	in a, (#fe)
 	rra
 	jr nc, key_1
 	rra
@@ -25,23 +25,23 @@ read_keyboard:
 	jr c, read_keyboard
 
 key_5:
-	ld de, 0x040C
+	ld de, #040C
 	jr invoke
 
 key_2:
-	ld de, 0x0103
+	ld de, #0103
 	jr invoke
 
 key_3:
-	ld de, 0x0206
+	ld de, #0206
 	jr invoke
 
 key_4:
-	ld de, 0x0309
+	ld de, #0309
 	jr invoke
 
 key_1:
-	ld de, 0x0000
+	ld de, #0000
 invoke:
 	push de
 	call highlight_key
@@ -64,10 +64,10 @@ highlight_key:
 	ld d, 0
 	add hl, de
 	ld e, 30
-	ld b, 15
-highlight_block:
 	ld a, (hl)
 	xor %01000000
+	ld b, 15
+highlight_block:
 	ld (hl), a
 	inc hl
 	ld (hl), a