On Thu, Jun 11, 2015 at 8:36 AM, Kurt McCullum <kurt.mccul...@att.net> wrote: > Does this book still exist? > > "The Secrets of the Option ROM Revealed" by Mo Budlong >
It exists at my house. Mo also wrote RBASIC. The main takeaway though is the boilerplate assembly code which you base an OptROM on, switching, and calls in/out of optrom to the main ROM. The boilerplate code inlcudes the ROM portion of interrupt handlers that need to be present since when the OptROM is switched in since interrupts can happen any time. It also includes the "installation" code. Steve and I worked a bit on the "shell" and maybe the call code. If anyone wants to write their own OptROM I think we can get you some code. -- John.
