added panic screen, added versioning mechanism proposal

2019-10-13 11:29:02 +02:00
1 parent 890558213a
commit 5a231c1847
@@ -0,0 +1,22 @@
+// BASIC Cold start entry point
+// Compute's Mapping the 64 p211
+
+basic_cold_start:
+
+	// Before doing anything, check if we have a compatible BASIC/KERNAL pair
+
+	ldy #(__rom_revision_basic_end - rom_revision_basic - 1)
+!:
+	lda rom_revision_basic, y
+	cmp rom_revision_kernal, y
+	beq !+
+
+	panic #P_ERR_ROM_MISMATCH
+
+!:
+	dey
+	bpl !--
+
+	// Remaining part wouldn't fit here
+
+	jmp basic_cold_start_internal