Here is a Patch that will make 1943 work as MMC3 Mapper 4
No-Intro Name: 1943 - The Battle of Midway (USA)
(No-Intro version 20130731-235630)
File SHA-1: 443D235FBDD0E0B3ADB1DCF18C6CAA7ECEEC8BEE
ROM SHA-1: 1E76A86398F069DA43B25351EF419BE664D630C5
ROM CRC32: 0x12c6d5c7
ROM MD5: 0x190d10a3685f87ba32135ac595283f36