initial concept of ROM versioning, still needs quite some work

c64/basic/initmsg_real.s

@@ -0,0 +1,48 @@
+
+// Routine is too long to fit in the original location
+
+
+initmsg_real:
+
+	// Print startup banner, up to 255 characters
+	ldx #$00
+!:
+	lda startup_banner, x
+	beq !+ // 0 means end of banner
+	jsr JCHROUT
+	inx
+	bne !-
+
+!:
+	// Print ROM revision
+	lda #<rom_revision_basic_string
+	ldy #>rom_revision_basic_string
+	jsr STROUT
+
+	// Print PAL/NTSC, if configured
+
+#if CONFIG_BANNER_PAL_NTSC
+	jsr print_pal_ntsc
+#endif
+
+	jsr initmsg_double_return
+	jsr print_return
+
+	// Work out free bytes, display them
+	jsr basic_do_new
+    sec
+	lda MEMSIZ+0
+	sbc TXTTAB+0
+	tax
+	lda MEMSIZ+1
+	sbc TXTTAB+1
+
+	jsr print_integer
+
+	// Print rest of the start up message
+	ldx #34
+	jsr print_packed_message
+
+initmsg_double_return:
+	jsr print_return
+	jmp print_return