Regarding your entry on the Amiga CHIP-8 interpreter (https://chip-8.github.io/extensions/#amiga-chip-8-interpreter):
The comment on Fx1E doesn't seem complete, as it suggests something happens if I + Vx overflows. It looks to me that there is no overflow handling in that opcode at all, besides being a 16-bit add, so it kinda behaves like the original VIP, I would say, so I wouldn't call it altered.
My comment is based on the Fred Fish 537 version, I couldn't find any other version yet. (I was looking at it, as I had the same hope about finding a VF handling that would explain the Spacefight 2091 mystery, but that interpreter would not be able to execute the game, partly due to missing opcodes, but the FF537 one also might be too old to be SCHIP compatible.)
Regarding your entry on the Amiga CHIP-8 interpreter (https://chip-8.github.io/extensions/#amiga-chip-8-interpreter): The comment on
Fx1Edoesn't seem complete, as it suggests something happens ifI + Vxoverflows. It looks to me that there is no overflow handling in that opcode at all, besides being a 16-bit add, so it kinda behaves like the original VIP, I would say, so I wouldn't call it altered.My comment is based on the Fred Fish 537 version, I couldn't find any other version yet. (I was looking at it, as I had the same hope about finding a
VFhandling that would explain the Spacefight 2091 mystery, but that interpreter would not be able to execute the game, partly due to missing opcodes, but the FF537 one also might be too old to be SCHIP compatible.)