This is the result of testing EEPROM support under Genesis Plus.
Following games use custom external RAM (serial EEPROM) for backup.
It seems that different EEPROM Mapper have been used, depending upon companies.

Eke~Eke - July 2007


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ACCLAIM (81)
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NBA Jam (UE)
NBA Jam (J)
------------
T-081326
T-81033
header OK ($200001-$200001)

TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0xFF (24C02)
PAGE_MASK: 0x03
SDA_IN : 0x200000 (0)
SDA_OUT: 0x200000 (1)
SCL : 0x200000 (1)

Note: this game uses a different EEPROM mapper than other Acclaim games.


Blockbuster World Video Game Championship II (U)
NBA Jam Tournament Edition (JUE)
------------------------------------------------
T-81406
header KO

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0xFF (24C02)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200000 (0)

Note: Rev 00 of the game has buggy eeprom support (incorrect data written), game backup only work with Rev01 version (released apparently in 2002, eight years later !)


NFL Quarterback Club (JUE)
-----------------------------
T-081276
header OK ($200000-$200001)

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0xFF (24C02)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200000 (0)


NFL Quarterback Club 96 (UE)
-----------------------------
T-081586
header OK ($200000-$200001)

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0x7FF (24C16)
PAGE_MASK: 0x07
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200000 (0)


College Slam (U)
----------------
T-81576
header OK ($200001-$200001)

TYPE: 16BITS WORD ADDRESS
SIZE_MASK: 0x1FFF (24C64)
PAGE_MASK: 0x07
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200000 (0)


Frank Thomas Big Hurt Baseball (UE)
----------------
T-81476
header OK ($200000-$200001)

TYPE: 16BITS WORD ADDRESS
SIZE_MASK: 0x1FFF (24C64)
PAGE_MASK: 0x07
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200000 (0)



-------------------------------------------------------
CAPCOM (12)
-------------------------------------------------------

Megaman - The Wily Wars (E)
Rockman Mega World (J) [alt]
----------------
T-12046
T-12053 (checksum = 0xEA80)
header OK ($200001-$200001)

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200001 (1)

NOTE: the original version of Rockman Mega World (J) uses traditional SRAM, header gives $200000-$203FFF range
the alternate version uses a 128bytes serial EEPROM (X24C01)
the two versions share the same GAME NAME and PRODUCT ID



-------------------------------------------------------
Electronic Arts (50)
-------------------------------------------------------

NHLPA Hockey 93 (UE)
----------------
T-50396
header KO

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200000 (7)
SDA_OUT: 0x200000 (7)
SCL : 0x200000 (6)


Rings of Power (UE)
----------------
T-50176
header KO

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200000 (7)
SDA_OUT: 0x200000 (7)
SCL : 0x200000 (6)



-------------------------------------------------------
SEGA
-------------------------------------------------------

Evander 'Real Deal' Holyfield's Boxing (JUE)
----------------------------------
MK-1215
header OK ($200001-$200001)

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200001 (1)


Greatest Heavyweights of the Ring (U)
Greatest Heavyweights of the Ring (J)
Greatest Heavyweights of the Ring (E)
-----------------------------
MK-1228
G-5538
PR-1993
header OK ($200001-$200001)

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200001 (1)


Wonder Boy in Monster World (UE)
Wonder Boy V - Monster World III (J)
----------------
G-4060
header OK ($200001-$200001)

TYPE: 7BITS WORD ADDRESS
SIZE_MASK: 0x7F (24C01)
PAGE_MASK: 0x03
SDA_IN : 0x200001 (0)
SDA_OUT: 0x200001 (0)
SCL : 0x200001 (1)



-------------------------------------------------------
CODEMASTERS
-------------------------------------------------------

Micro Machines 2 - Turbo Tournament (E) (J-Cart)
------------------------------------------------
T-120096-50
header KO

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0x3FF (24C08)
PAGE_MASK: 0x0F
SDA_IN : 0x300000 (0)
SDA_OUT: 0x380001 (7)
SCL : 0x300000 (1)

Note: this game needs the EEPROM to be initially fullfilled with the string
"PETETEST01234567" otherwise it won't initialize memory with correct data.


Micro Machines Military (E) (J-Cart)
------------------------------------
00000000-00 (checksum = 0x168B or 0xCEE0)
header KO

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0x3FF (24C08)
PAGE_MASK: 0x0F
SDA_IN : 0x300000 (0)
SDA_OUT: 0x380001 (7)
SCL : 0x300000 (1)


Micro Machines Turbo Tournament 96 (E) (J-Cart)
------------------------------------------------
00000000-00 (checksum = 0x165E or 0x2C41)
header KO

TYPE: TYPE: 8BITS WORD ADDRESS
SIZE_MASK: 0x7FF (24C16)
PAGE_MASK: 0xF
SDA_IN : 0x300000 (0)
SDA_OUT: 0x380001 (7)
SCL : 0x300000 (1)