Saving to flags

You're writing a cool asm patch when you realize that you want to save a number to the current save file, so it sticks around even if the player resets. How do you do that?

There are a bunch of ways, but the easiest is just to overwrite some flags. This has the advantage of being compatible with any patches that rearrange SRAM, such as coop's extended flags patch.

The easiest way to explain this is through an example:

• flags 57 through 64 for the current save file are stored in RAM at 0x7E9C0F
• make sure your hack isn't using any of those flags
• write your assembly hack to LDA/STA your number from 0x7E9C0F (make sure you're using 8-bit mode!)
• that's it! The game's save/load code will handle the rest

If you want a number that goes higher than 255, or just can't be bothered to use 8-bit mode:

• pick two bytes in a row of flags, like 57 through 72, stored at 0x7E9C0F-0x7E9C10
• LDA/STA to 0x7E9C0F
• That's it!

The giant table of flag to address

Okay, well how do I know which flags correspond to which address? Glad you asked, here's a giant table.

First flag	Last flag	Address
1	8	9C08
9	16	9C09
17	24	9C0A
25	32	9C0B
33	40	9C0C
41	48	9C0D
49	56	9C0E
57	64	9C0F
65	72	9C10
73	80	9C11
81	88	9C12
89	96	9C13
97	104	9C14
105	112	9C15
113	120	9C16
121	128	9C17
129	136	9C18
137	144	9C19
145	152	9C1A
153	160	9C1B
161	168	9C1C
169	176	9C1D
177	184	9C1E
185	192	9C1F
193	200	9C20
201	208	9C21
209	216	9C22
217	224	9C23
225	232	9C24
233	240	9C25
241	248	9C26
249	256	9C27
257	264	9C28
265	272	9C29
273	280	9C2A
281	288	9C2B
289	296	9C2C
297	304	9C2D
305	312	9C2E
313	320	9C2F
321	328	9C30
329	336	9C31
337	344	9C32
345	352	9C33
353	360	9C34
361	368	9C35
369	376	9C36
377	384	9C37
385	392	9C38
393	400	9C39
401	408	9C3A
409	416	9C3B
417	424	9C3C
425	432	9C3D
433	440	9C3E
441	448	9C3F
449	456	9C40
457	464	9C41
465	472	9C42
473	480	9C43
481	488	9C44
489	496	9C45
497	504	9C46
505	512	9C47
513	520	9C48
521	528	9C49
529	536	9C4A
537	544	9C4B
545	552	9C4C
553	560	9C4D
561	568	9C4E
569	576	9C4F
577	584	9C50
585	592	9C51
593	600	9C52
601	608	9C53
609	616	9C54
617	624	9C55
625	632	9C56
633	640	9C57
641	648	9C58
649	656	9C59
657	664	9C5A
665	672	9C5B
673	680	9C5C
681	688	9C5D
689	696	9C5E
697	704	9C5F
705	712	9C60
713	720	9C61
721	728	9C62
729	736	9C63
737	744	9C64
745	752	9C65
753	760	9C66
761	768	9C67
769	776	9C68
777	784	9C69
785	792	9C6A
793	800	9C6B
801	808	9C6C
809	816	9C6D
817	824	9C6E
825	832	9C6F
833	840	9C70
841	848	9C71
849	856	9C72
857	864	9C73
865	872	9C74
873	880	9C75
881	888	9C76
889	896	9C77
897	904	9C78
905	912	9C79
913	920	9C7A
921	928	9C7B
929	936	9C7C
937	944	9C7D
945	952	9C7E
953	960	9C7F
961	968	9C80
969	976	9C81
977	984	9C82
985	992	9C83
993	1000	9C84
1001	1008	9C85
1009	1016	9C86
1017	1024	9C87

Another giant table for people with the expanded flags patch

But you're using the ever-popular expand_flags.ccs by cooprocks123e. Can you do this with all those expanded flags?

Yes.

First flag	Last flag	Address
1025	1032	B600
1033	1040	B601
1041	1048	B602
1049	1056	B603
1057	1064	B604
1065	1072	B605
1073	1080	B606
1081	1088	B607
1089	1096	B608
1097	1104	B609
1105	1112	B60A
1113	1120	B60B
1121	1128	B60C
1129	1136	B60D
1137	1144	B60E
1145	1152	B60F
1153	1160	B610
1161	1168	B611
1169	1176	B612
1177	1184	B613
1185	1192	B614
1193	1200	B615
1201	1208	B616
1209	1216	B617
1217	1224	B618
1225	1232	B619
1233	1240	B61A
1241	1248	B61B
1249	1256	B61C
1257	1264	B61D
1265	1272	B61E
1273	1280	B61F
1281	1288	B620
1289	1296	B621
1297	1304	B622
1305	1312	B623
1313	1320	B624
1321	1328	B625
1329	1336	B626
1337	1344	B627
1345	1352	B628
1353	1360	B629
1361	1368	B62A
1369	1376	B62B
1377	1384	B62C
1385	1392	B62D
1393	1400	B62E
1401	1408	B62F
1409	1416	B630
1417	1424	B631
1425	1432	B632
1433	1440	B633
1441	1448	B634
1449	1456	B635
1457	1464	B636
1465	1472	B637
1473	1480	B638
1481	1488	B639
1489	1496	B63A
1497	1504	B63B
1505	1512	B63C
1513	1520	B63D
1521	1528	B63E
1529	1536	B63F
1537	1544	B640
1545	1552	B641
1553	1560	B642
1561	1568	B643
1569	1576	B644
1577	1584	B645
1585	1592	B646
1593	1600	B647
1601	1608	B648
1609	1616	B649
1617	1624	B64A
1625	1632	B64B
1633	1640	B64C
1641	1648	B64D
1649	1656	B64E
1657	1664	B64F
1665	1672	B650
1673	1680	B651
1681	1688	B652
1689	1696	B653
1697	1704	B654
1705	1712	B655
1713	1720	B656
1721	1728	B657
1729	1736	B658
1737	1744	B659
1745	1752	B65A
1753	1760	B65B
1761	1768	B65C
1769	1776	B65D
1777	1784	B65E
1785	1792	B65F
1793	1800	B660
1801	1808	B661
1809	1816	B662
1817	1824	B663
1825	1832	B664
1833	1840	B665
1841	1848	B666
1849	1856	B667
1857	1864	B668
1865	1872	B669
1873	1880	B66A
1881	1888	B66B
1889	1896	B66C
1897	1904	B66D
1905	1912	B66E
1913	1920	B66F
1921	1928	B670
1929	1936	B671
1937	1944	B672
1945	1952	B673
1953	1960	B674
1961	1968	B675
1969	1976	B676
1977	1984	B677
1985	1992	B678
1993	2000	B679
2001	2008	B67A
2009	2016	B67B
2017	2024	B67C
2025	2032	B67D
2033	2040	B67E
2041	2048	B67F
2049	2056	B680
2057	2064	B681
2065	2072	B682
2073	2080	B683
2081	2088	B684
2089	2096	B685
2097	2104	B686
2105	2112	B687
2113	2120	B688
2121	2128	B689
2129	2136	B68A
2137	2144	B68B
2145	2152	B68C
2153	2160	B68D
2161	2168	B68E
2169	2176	B68F
2177	2184	B690
2185	2192	B691
2193	2200	B692
2201	2208	B693
2209	2216	B694
2217	2224	B695
2225	2232	B696
2233	2240	B697
2241	2248	B698
2249	2256	B699
2257	2264	B69A
2265	2272	B69B
2273	2280	B69C