I'm trying to complete the original Ultima I on an Apple //e.
These instructions explain space flight, but I can't seem to destroy enemy ships in order to become a Space Ace, even when I should be able to.
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Are you using an enhanced //e? If so you'll need to get a patched copy, or copy and patch yours.
The original (non-remake) Apple II version uses an undocumented 6502 opcode in the space flight code. This makes it impossible to hit the alien ships when running on a 65C02.
The fix is in file "FGT3". Change the bytes at 74D1 to 46 43 45 43 (all hex).