startup banner support cleanup

src/basic/init/initmsg_m65.s

@@ -0,0 +1,44 @@
+// #LAYOUT# M65 BASIC_1 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+
+// Routine is too long to fit in the original location
+
+// XXX banner-related code needs cleanup, move MEGA65 stuff to a separate file
+
+
+INITMSG:
+
+	// Clear the screen first, some cartridges (like IEEE-488) are leaving a mess on the screen
+	lda #147
+	jsr JCHROUT
+
+	lda #<startup_banner
+	ldy #>startup_banner
+	jsr STROUT
+
+	jsr M65_ISMODE65
+	bcc !+                             // XXX for MEGA65 native mode, display something else instead
+
+	ldx #$02
+	ldy #$21
+	jsr plot_set
+
+	lda #<startup_banner_legacy
+	ldy #>startup_banner_legacy
+	jsr STROUT
+!:
+
+	ldx #$05
+	ldy #$00
+	jsr plot_set
+
+	lda #<rom_revision_basic_string
+	ldy #>rom_revision_basic_string
+	jsr STROUT
+
+	ldx #$05
+	ldy #$12
+	jsr plot_set
+
+	jsr initmsg_bytes_free