Ok, I got a tech support question today that I have no idea how to answer. Someone wants to know if they can allocate 192kbytes of contiguous memory in 32-bit protected mode on our CPU board (x86 compat.) Their statement was: "The xPC Operating System requires a CPU running in 32-bit protected mode. What do you understand by this in respect of the ability of the CPU to give a 192k contiguous block of memory (or otherwise)" Then another engineer said to me: "Do you have any information available on memory mapping in PC systems running in 32 bit protected mode? ISA memory mapping is 16MByte full addressing so I guess we should have plenty addressing area available." For some reason everyone here seems to think I know this, but I have no clue.. where can I start looking for the answer to this?