Great Hierophant
Veteran Member
I know that Lode Runner for the IBM PC doesn't work with a V20, and it supposedly can be patched. Apparently the problem is that the game uses the undocumented instruction POP CS, Opcode 0F, which only works on an 8088/8086 and was repurposed for the 80186 and more advanced CPUs. The V20 apparently doesn't implement it. It should be NOPed out or worked around. How can it be done? What hex string should I be looking for?
Does anyone know if Championship Lode Runner also has this issue?
Edit : The Retrograde Station DOS conversion will work just fine with an NEC V20 and an IBM PCjr. Presumably it was already patched when hacked. However, the game runs too fast.
Does anyone know if Championship Lode Runner also has this issue?
Edit : The Retrograde Station DOS conversion will work just fine with an NEC V20 and an IBM PCjr. Presumably it was already patched when hacked. However, the game runs too fast.
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