From 32f0bb9f1f3b9993af4b563865a038b43c7f0310 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Thu, 28 Jan 2016 02:43:40 -0800
Subject: [PATCH] GB Memory: Add SRAM bank switching to MBC5

---
 src/gb/gb.c     | 9 +++++----
 src/gb/memory.c | 5 +++++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/gb/gb.c b/src/gb/gb.c
index 7197bde15..cc02f0347 100644
--- a/src/gb/gb.c
+++ b/src/gb/gb.c
@@ -81,12 +81,13 @@ bool GBLoadROM(struct GB* gb, struct VFile* vf, struct VFile* sav, const char* f
 	gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
 	gb->sramVf = sav;
 	if (sav) {
-		if (sav->size(sav) < 0x8000) {
-			sav->truncate(sav, 0x8000);
+		// TODO: Do this in bank-switching code
+		if (sav->size(sav) < 0x20000) {
+			sav->truncate(sav, 0x20000);
 		}
-		gb->memory.sram = sav->map(sav, 0x8000, MAP_WRITE);
+		gb->memory.sram = sav->map(sav, 0x20000, MAP_WRITE);
 	} else {
-		gb->memory.sram = anonymousMemoryMap(0x8000);
+		gb->memory.sram = anonymousMemoryMap(0x20000);
 	}
 	return true;
 	// TODO: error check
diff --git a/src/gb/memory.c b/src/gb/memory.c
index e6baee749..72c1c25bc 100644
--- a/src/gb/memory.c
+++ b/src/gb/memory.c
@@ -419,6 +419,11 @@ void _GBMBC5(struct GBMemory* memory, uint16_t address, uint8_t value) {
 	case 0x1:
 		_switchBank(memory, bank);
 		break;
+	case 0x2:
+		if (value < 0x10) {
+			_switchSramBank(memory, value);
+		}
+		break;
 	default:
 		// TODO
 		mLOG(GB_MBC, STUB, "MBC5 unknown address: %04X:%02X", address, value);