improved tape support with Mega65 native mode

src/kernal/screen_m65/mega65_scrmodeset.s

@@ -60,38 +60,19 @@ m65_scrmodeset_internal: // entry point for M65_MODE65
 	stx VIC_SCRNPTR+1
 	stx M65_SCRTXTBASE+1
 
-	// Set flags for 40/80 columns and 25/50 rows
+	// Set flags/varaibles for 40/80 columns and 25/50 rows
 
-	asl
 	tax
-	lda VIC_SCFLAGS
-	jsr_ind_x m65_scrmodeset_flagtab
+
+	lda m65_scrtab_vic_ctrlb,x
+	sta VIC_CTRLB
 
 	rts
 
-m65_scrmodeset_flagtab:
-
-	.word m65_scrmodeset_40x25
-	.word m65_scrmodeset_80x25
-	.word m65_scrmodeset_80x50
 
 
-m65_scrmodeset_40x25:
+m65_scrtab_vic_ctrlb:
 
-	and #$77
-	bra !+
-
-m65_scrmodeset_80x25:
-
-	and #$F7
-	ora #$80
-	skip_2_bytes_trash_nvz
-
-	// FALLTROUGH
-
-m65_scrmodeset_80x50:
-
-	ora #$88
-!:
-	sta VIC_SCFLAGS
-	rts
+	.byte %00000000 // 40x25
+	.byte %10000000 // 80x25
+	.byte %10000100 // 80x50