SF2 mapper...
Posted: Mon Jan 19, 2009 5:24 am
extended! Version 2.0.
Writing to $xxx0-$xxxF in either bank 0 or 1 selects a 512k segment to be mapped into the upper 512k of the lower 1megabyte memory range. I split the 64megabit memory range across two chips since my programmer only handles up to 40 pin chips Plus, I doubt I could find a 64Mx8bit compatible rom.
Street Fighter 2 uses $xxx0-$xxx3 of Bank 0, so it should work fine with that rom. /Y0 and /Y1 of the '139 go to /CS of the lower 512k separate rom.
Writing to $xxx0-$xxxF in either bank 0 or 1 selects a 512k segment to be mapped into the upper 512k of the lower 1megabyte memory range. I split the 64megabit memory range across two chips since my programmer only handles up to 40 pin chips Plus, I doubt I could find a 64Mx8bit compatible rom.
Street Fighter 2 uses $xxx0-$xxx3 of Bank 0, so it should work fine with that rom. /Y0 and /Y1 of the '139 go to /CS of the lower 512k separate rom.