Lacks the ROM part. Option 2 on the menu screen makes the cartridge try to execute code at 6e9e.

8B5B: DATA  >00,>00,>8B,>6F,>0F
8B60: TEXT 'INIT SUPPLEMENT'
8B6F: CALL  GROM@>64CF
8B72: DST   >6E9E,@>8300
8B76: XML   >F0
8B78: RTN


64CF: DCLR  @>7000
64D3: MOVE  >0FFF BYTES FROM @>7000 TO @>7001
64DC: DST   >A55A,@>7000
64E2: DST   >7022,@>834A
64E6: ST    @>A000,@>834C
64EB: INV   @>834C
64ED: ST    @>834C,@>A000
64F2: CEQ   @>834C,@>A000
64F7: BR    GROM@>651B

64F9: DST   >A000,@>0000(@>834A)
6500: DINCT @>834A
6502: DST   >FFE0,@>0000(@>834A)
6509: DINCT @>834A
650B: DST   >2000,@>0000(@>834A)
6512: DINCT @>834A
6514: DST   >3FFF,@>0000(@>834A)

651B: DST   >701C,@>834A
651F: DST   >7118,@>0000(@>834A)
6526: DINCT @>834A
6528: DST   >8000,@>0000(@>834A)
652F: RTN
