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Slot 2 Mapping Flat Code in $00000 - $0bfff [1]
The only differences between the Image Works and Virgin Games versions of Speedball are within the ROM header and the data for the initial logo screen & title screen.
In the ROM header, the two ROMs have different product codes (IW: 25009, VG: 25013) and different version numbers (IW: 0, VG: 1).
The logo screen is completely different between the two versions:
On the title screen, the Image Works ROM shows "© MIRRORSOFT LTD 1990
" while the Virgin ROM has "© VIRGIN GAMES 1992
".
Researched by RetroSpark