added panic screen, added versioning mechanism proposal

c64/basic/rom_revision/bf52.rom_revision_basic.s

@@ -0,0 +1,25 @@
+
+//
+// !!! PROPOSAL ONLY !!! PROPOSAL ONLY !!! NOT FOR USING EXTERNALLY YET !!!
+//
+//
+// Do not change! Locations of the following data should be constant - now and forever!
+//
+// If you want to integrate Open ROMs support in your emulator, FPGA ccomputer, etc. - this
+// is the official way to recognize the ROM and it's revision.
+//
+
+
+rom_revision_basic:
+
+	// $BF52
+
+	.text "OR"                // project signature, after "Open ROMs"
+	.byte CONFIG_ID           // config file ID, might change between revisions
+
+rom_revision_basic_string:
+
+	.text "(DEVEL SNAPSHOT)"  // actual ROM revision string; up to 16 characters
+	.byte $00                 // marks the end of string
+
+__rom_revision_basic_end: