On Fri, Mar 25, 2016 at 8:20 AM, Kurt McCullum <[email protected]> wrote:
> I want to get a data HEX dump of the option ROM on my NEC. It's an older > Ultimate ROM that I have not found elsewhere and I just wanted to get a > copy of it. > With the system ROM I just PEEKed the values and sent them out the serial > port. Is there a similar trick to doing this with the Option ROM? > > Kurt > > The problem is you need to switch from ROM land to Option ROM land to read the Option ROM. Once you're in Option ROM land ROM land (including the BASIC interpreter) is inaccessible except through a "far call" trampoline. So it's pretty much a task for machine language or at least a ML subroutine. -- John.
