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OpenSRAM::
; if invalid bank, sram is disabled
cp NUM_SRAM_BANKS
jr c, .valid
jr CloseSRAM
.valid:
; 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
CloseSRAM::
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
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