Re: EMM386 and A20 gate control under Microsoft Virtual PC 2007
Posted on 2020-05-24, 19:06
This would imply that the emulator does not implement the behavior of A20Gate, whether it is the standard IBM PC AT method controlled by KBC port 60h/64h or the FAST_A20 implementation using port 92h. When there is no A20GATE, the address simply won't wrap around at 1MB boundary. It could be faulty …