8086 programming

visual emulator / debugger for statically compiled Linux executables, used in Cosmopolitan

https://en.wikipedia.org/wiki/X86_memory_segmentation effective address is:

uint16_t *base, *offset;
uint32_t *effective = base<<4+offset;

https://en.wikipedia.org/wiki/X86_memory_models

I might have explained this before, but normally a near call to a far function will break, because it'll pop 4 bytes off the stack for the return address, when the near call only pushed 2.

So you fix this by doing push CS first, so it'll pop the 2 from the call, and then the 2 you placed before.

– Foone

https://astralvx.com/debugging-16-bit-in-qemu-with-gdb-on-windows/

floating point co-processor