theN64 Myth I/O list V1.1 and the Upgrade Core
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NEO N64 CARD MENU IO
WRITE N64 N64 SRAM area
RUN_IO > $10040020 W:FFFF --- other IO can't change, because must lock the RUN_IO when play the N64 game
INT_IO > $10040024 W:FFFF --- enter SOFT MENU MODE
W:0000 --- OFF
all the follow CMDs is valid ONLY after INI_IO active
NEO_IO > $10040028 W:FFFF READ $?2000000 $x3FFFFFF the Neo N64 Myth hardware only can load 16bit data ( the NEO CARD COMMAND mode)
W:0000 OFF
ROMC_IO > $1004002C W:FFFF RUN CARD
W:0000 OFF
ROMSW_IO > $10040030 W:0000 = NEO GBA CARD TO N64 ROM ADR $?2000000 $x3FFFFFF
NEO N64 MENU TO N64 ROM ADR $?0000000~$x1FFFFFF
$10040030 W:FFFF = NEO GBA CARD TO N64 ROM ADR $?0000000 $x3FFFFFF
NEO N64 MENU OFF
SRAM2C_IO > $10040034 W:FFFF = NEO GBA CARD SRAM TO N64 SRAM $10000000~$1003FFFF
it's valid only when disable the SAVE_IO
RST_IO > $10040038 W:FFFF = PUSH N64 RESET BACK MENU MODE
W:0000 = NO RESET BACK MENU MODE
CIC_IO > $1004003C W:FFFF = CIC OPEN
W:0000 = CIC use the default setting
SAVE_IO > $10040000 W:0000 > EXT CARD SAVE
W:0001 > SRAM 32KB
W:0002 > SRAM 64KB
W:0003 > SRAM 128KB
W:0004 > FRAM 128KB (FLASH RAM )
W:0005 > EEP4K
W:0006 > EEP16K
W:0008 > SRAM 256KB < INT_IO MODE
W:000F > SAVE OFF
CIC_IO > $10040004 W:0000 > EXT CARD CIC
W:0001 > 6101
W:0002 > 6102
W:0003 > 6103
W:0005 > 6105
W:0006 > 6106
ROM_BANK > $10040008 BIT0 = RA22
BIT1 = RA23
BIT2 = RA24
BIT3 = RA25
BANK minimum is 64Mbit
BANK maximum is 1Gbit
ROM_SIZE > $1004000C BIT0 >0 ( NA22 = RA22 )
BIT1 >0 ( NA23 = RA23 )
BIT2 >0 ( NA24 = RA24 )
BIT3 >0 ( NA25 = RA25 )
NAXX = N64 ADR
RAXX = GBA CARD ADR

upgrade core download:
http://www.neoflash.com/myth/NEO_N64_Myth_Cart_Upgrade_Core_v1.1.rar