various I/O updates

c64/kernal/iostack/f4a5.load.s

@@ -16,7 +16,6 @@
 	// On exit, $YYXX is the highest address into which data
 	// will have been placed.
 
-	// XXX add VERIFY support
 
 LOAD:
 

c64/kernal/iostack/f5ed.save.s

@@ -10,4 +10,21 @@
 //
 
 SAVE:
-	STUB_IMPLEMENTATION()
+
+	// Reset status
+	jsr kernalstatus_reset
+
+#if CONFIG_MEMORY_MODEL_60K
+	// We need our helpers to get to filenames under ROMs or IO area
+	jsr install_ram_routines
+#endif
+
+	// Check whether we support the requested device
+	lda FA
+
+#if CONFIG_IEC
+	jsr iec_check_devnum_lvs
+	bcc_far save_iec
+#endif
+
+	jmp lvs_illegal_device_number 

c64/kernal/iostack/findfls.s

@@ -7,7 +7,6 @@
 find_fls:
 
 	ldy LDTND
-	beq find_fls_not_found // table empty
 !:
 	dey
 	bmi find_fls_not_found // no more entries

c64/kernal/iostack/lvs_helpers.s

@@ -73,16 +73,32 @@ lvs_handle_byte_verify:
 
 #if CONFIG_MEMORY_MODEL_60K
 
-	// XXX implement this part
+	// Store byte for comparing
+	sta TBTCNT
+
+	// Retrieve byte from under ROMs and IO if required
+	php
+	sei
+	ldx #$33
+	stx $01
+	ldy #0
+	lda (STAL),y
+	ldx #$37
+	stx $01
+	plp
+	
+	// Compare with stored byte
+	cmp TBTCNT
 
 #else
 
 	ldy #0
 	cmp (STAL),y
-	beq lvs_handle_byte_load_verify_end
 
 #endif
 
+	beq lvs_handle_byte_load_verify_end
+
 	sec
 	rts