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The $2 checksum range bug isįixed, even though the previously released incompatible BIOSes meant that
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Its checking routines are almost identical to those of the US/European This BIOS features a different bumper screen to previous versions, with US/European BIOS with Alex Kidd in Miracle World bumper screen US/European BIOS with Alex Kidd in Miracle World (1990) Has plenty of unused space for the BIOS routines to be added. If no game is found, instead of showing an information screen, it runsĪ copy of Hang On and Safari Hunt built in to the BIOS ROM. Restore the current mapped bank (assuming a Sega It additionally includes support in the checksum routines to save and Lookup table preceding it), which was overlooked in this version, the $2Ĭhecksum range will not be correctly summed. Version (where an opcode's first byte is used as the last byte of the However, due to an overzealous optimization in that This aspect of its operation is almost identical to the US/European Master If not, it checks for valid data on the three slots. It runs the same "Snail Maze" secret game as the US/European Master If, at the end of this phase,īuttons + + are being pressed on controller 1 (and no other buttons), This BIOS shows the same bumper screen as the US v1.3 BIOS (except theĭate is changed to 1988). US/European BIOS v2.4 with Hang On and Safari Hunt (1988) It doesn't store the commonly used VDP routines (WriteVRAMByte, etc.) at the beginning of the ROM to take advantage of the rst opcodes.
#Magic engine bios code