Great, that's what I was doing. I have copied the code from CPU_Interrupt renaming the Descriptor from "gate" to "call" and it seems to be working up to now. Thanks!

Hi! I've modified the CPU_CALL method on the cpu.cpp file adding the DESC_286_TSS_A case on the DESC_386_TSS_A branch. This works fine for the type 0x01 descriptor. Now I've found another problem: the DESC_TASK_GATE (0x05) descriptor. I have found a 0x9A opcode that uses this kind of descriptor and …

Thanks for your fast answer! I've been making changes to the CPU_SwitchTask method. Basicaly I have commented the 'E_Exit("286 task switch")' lines and applied the same operations used in the 386 part but using non extended registers (I mean AX instead EAX, for example) and TSS_16 descriptors. I'm …

Hi! I'm trying to run a ROM file in Dosbox bypassing the shell. The program was part of an old embedded system I have to emulate. It runs ok in real mode but there is a problem when switching to protected mode. It prepares correctly the memory to start running tasks but when it tries to jump to the …