1 files changed, 34 insertions, 0 deletions
diff --git a/home/sram.asm b/home/sram.asm
new file mode 100644
index 000000000..3c42e7618
--- /dev/null
+++ b/home/sram.asm
@@ -0,0 +1,34 @@
+GetSRAMBank: ; 2fcb
+; load sram bank a
+; if invalid bank, sram is disabled
+	cp NUM_SRAM_BANKS
+	jr c, OpenSRAM
+	jr CloseSRAM
+; 2fd1
+
+OpenSRAM: ; 2fd1
+; switch to sram bank a
+	push af
+; latch clock data
+	ld a, 1
+	ld [MBC3LatchClock], a
+; enable sram/clock write
+	ld a, SRAM_ENABLE
+	ld [MBC3SRamEnable], a
+; select sram bank
+	pop af
+	ld [MBC3SRamBank], a
+	ret
+; 2fe1
+
+CloseSRAM: ; 2fe1
+	push af
+	ld a, SRAM_DISABLE
+; reset clock latch for next time
+	ld [MBC3LatchClock], a
+; disable sram/clock write
+	ld [MBC3SRamEnable], a
+	pop af
+	ret
+; 2fec
+