further IO stack refactoring

c64/kernal/memory/fd15.restor.s

@@ -0,0 +1,24 @@
+
+//
+// Official Kernal routine, described in:
+//
+// - [RG64] C64 Programmer's Reference Guide   - page 293 (RESTOR), 304 (VECTOR)
+// - [CM64] Compute's Mapping the Commodore 64 - page 237
+//
+// CPU registers that has to be preserved (see [RG64]): none
+//
+
+RESTOR:
+
+	clc // clear carry - for writing to system table
+	ldy #>vector_defaults
+	ldx #<vector_defaults
+
+	// FALLTHROUGH
+
+VECTOR:
+
+// Our implementation is longer than the original one,
+// placing it here would cause a collision with VECTOR defaults
+
+	jmp vector_real