some more Z80 work

src/zvm_m65/zvm_io.s

@@ -0,0 +1,20 @@
+
+;
+; Z80 Virtual Machine - I/O access
+;
+
+
+ZVM_fetch_IO:
+
+	; XXX fetch addresses via ADDR_IO - but which ones are safe?
+	;     should we have a whitelist?
+	
+	lda #$00
+	sta REG_A
+	rts
+
+ZVM_store_IO:
+
+	; XXX again, we should have a whitelist of addresses
+
+	rts