MEGA65 native screen fixes

src/kernal/screen_m65/mega65_scrmodeset.s

@@ -54,9 +54,9 @@ m65_scrmodeset_internal: // entry point for M65_MODE65
 	// Set the logical row length to 80
 
 	ldx #$50
-	// stx VIC_CHARSTEP+0
+	stx VIC_CHARSTEP+0
 	ldx #$00
-	// stx VIC_CHARSTEP+1
+	stx VIC_CHARSTEP+1
 	
 	// Set the following locations:
 	// - M64_SCRWINMODE                - for scroll-console mode
@@ -74,13 +74,12 @@ m65_scrmodeset_internal: // entry point for M65_MODE65
 	// - VIC_SCRNPTR+0/+1              - for screen viewport start
 	// - M65_COLVIEW, VIC_COLPTR       - for using color memory from the start
 
-	ldx #>($9000)
+	ldx #>MEMCONF_SCRBASE
 	stx M65_SCRBASE+1
 	stx VIC_SCRNPTR+1
 
-	ldx #<($9000)
+	ldx #<MEMCONF_SCRBASE
 	stx M65_SCRBASE+0
-
 	stx VIC_SCRNPTR+0
 
 	stx M65_COLVIEW+0
@@ -89,17 +88,17 @@ m65_scrmodeset_internal: // entry point for M65_MODE65
 	stx VIC_COLPTR+1
 
 	// Set the following locations:
-	// - M65_SCRGUARD, M65_COLGUARD    - for max 128 lines of virtual screen
+	// - M65_SCRGUARD, M65_COLGUARD    - for max lines of virtual screen
 	// - M65_COLVIEWMAX                - as above, but depending on the mode
 
-	ldx #<($9000 + 80 * 128)
+	ldx #<(MEMCONF_SCRBASE + 80 * MEMCONF_SCRROWS)
 	stx M65_SCRGUARD+0
-	ldx #>($9000 + 80 * 128)
+	ldx #>(MEMCONF_SCRBASE + 80 * MEMCONF_SCRROWS)
 	stx M65_SCRGUARD+1
 
-	ldx #<(80 * 128)
+	ldx #<(80 * MEMCONF_SCRROWS)
 	stx M65_COLGUARD+0
-	ldx #>(80 * 128)
+	ldx #>(80 * MEMCONF_SCRROWS)
 	stx M65_COLGUARD+1
 
 	ldx M65_SCRMODE